The word ‘hopefully’ has become the litmus test to determine whether one is a language snob or a language slob(William Safire)

‘满怀希望地’一词已经成为检验一个人在语言上是附庸风雅之徒还是墨守成规之人的试金石(威廉·萨菲尔)

chalk beer-wort yeast litmus milk

白垩、麦芽汁、酵母浸膏石蕊牛乳(培养基)

chalk blood yeast dextrose litmus milk

白垩、血、酵母浸膏石蕊牛乳

Chalk blood yeast dextrose litmus milk

白垩、血、酵母浸膏石蕊牛乳(培养基)

The equivalence point is determined by a detectable change, for instance, of colour in an indicator substance (e.g., litmus )or in an electrical property. Reactions used in titration include acid-base reactions, precipitations (see solution), formation of complexes, and oxidation-reduction reactions. See also pH.

等价点的确定可以通过指示剂颜色的变化(如石蕊)，或者从电性能的变化来判断。滴定法使用的反应有酸碱理论反应、沉淀、生成错合物以及氧化-还原。

Litmus Paper and Fibrin Sealant Help Prevent Potential Pancreatoenterostomy Leakage (Report of 47 Cases)

改良套叠式胰空肠吻合术应用石蕊试纸和纤维蛋白胶预防胰漏47例体会

More broadly, ammonium hydroxide (see ammonia)and soluble hydroxides of the alkaline earth metals are also called alkalies. Strong bases that turn litmus paper blue, they react with acids to yield salts, are caustic, and in concentrated form corrode tissues.

更广义的范围包括碱土金属。碱是强碱性的，会使红石蕊试纸变蓝色;它们与酸作用成为中性盐;它们是苛性的，其浓缩物可腐蚀有机组织。

Base: In chemistry, any substance that in water solution is slippery to the touch, tastes bitter, changes the colour of acid-base indicators (e.g., litmus paper), reacts with acids to form salts, and promotes certain chemical reactions (e.g., base catalysis).

碱:化学术语，其水溶液手感光滑、味涩，使指示剂变色(使红色石蕊试纸变蓝)，与酸反应生成盐，并能加速某些化学反应(碱催化)的一类物质的总称。

Litmus : Mixture of coloured organic compounds obtained from several species of lichens.

石蕊:从几种地衣类植物中获取的带色有机化合物的混合物。

Litmus and phenolphthalein are acid-base indicator s.

石蕊色素和酚酞是酸基指示剂.

a litmus test

石蕊试验.

litmus paper

石蕊试纸.

Litmus paper can be used as an indicator of the presence of acid in a solution.

石蕊试纸可用以测试溶液是否含酸.

Litmus paper turns red on contact with an acid.

石蕊试纸遇酸度会变红.

Acid: Any substance that in water solution tastes sour, changes the colour of acid-base indicators (e.g., litmus ), reacts with some metals (e.g., iron)to yield hydrogen gas, reacts with bases to form salts, and promotes certain chemical reactions (e.g., acid catalysis).

酸:在水溶液中有酸味，使某些酸碱指示剂变色(如石蕊)，与某些金属(如铁)反应放出氢，与碱反应生成盐，而且能加速某些化学反应(如酸催化的一类物质的总称。

In the form of a water solution or as litmus paper, it is the oldest and most-used indicator of whether a substance is an acid or a base. It turns red or pink in acid solutions and blue or purple-blue in alkaline solutions.

它的水溶液，或者做成石蕊纸后，是最古老和最常用的指示剂，可以指示一种物质是酸还是碱。在酸性溶液里它呈红色或粉红色，在碱性溶液里呈蓝色或紫-蓝色。

any of a large class of compounds, including the hydroxides and oxides of metals, having a bitter taste, a slippery solution, the ability to turn litmus blue, and the ability to react with acids to form salts.

一种有许多化合物的化学物,它含有金属氢氧化物和金属氧化物,带有苦味,溶液较滑,能使

any of a large class of compounds, including the hydroxides and oxides of metals, having a bitter taste, a slippery solution, the ability to turn litmus blue, and the ability to react with acids to form salts.

一种有许多化合物的化学物,它含有金属氢氧化物和金属氧化物,带有苦味,溶液较滑,能使石蕊试纸变蓝,并能与酸反应生成盐。

The pH value, measured by a pH meter, titration, or indicator (e.g., litmus )strips, helps inform chemists of the nature, composition, or extent of reaction of substances, biologists of the composition and environment of organisms or their parts or fluids, physicians of the functioning of bodily systems, and agronomists of the suitability of soils for crops and any treatments needed.

用酸碱度计、滴定或指示剂(例如石蕊)条来测定pH值，可以帮助化学家了解物质的性质、组分或反应的程度，帮助生物学家了解有机体或它们的各部分或流体的组成和环境，帮助医生了解整个身体系统的功能情况，帮助农学家们了解土壤对作物的适应性，是否需要作任何处理等。

A sense of control is the litmus test for success. The optimist feels in control of his own life.

有无控制感是成功的试金石。乐观者感到能够掌握自己的命运。

Any of various substances,such as litmus or phenolphthalein,that indicate the presence,absence,or concentration of another substance or the degree of reaction between two or more substances by means of a characteristic change,especially in color.

指示剂任何一种具有下列功能的物质，即能通过自身性质的变化，特别是颜色的变化来表明另一种物质的存在、消失或聚集，或可以表明两种以上的物质相互反应的程度;例如石蕊、酚酞

||1:Titration, to remind those who dozed through their chemistry lessons, is a way of working out the concentration of a substance in a solution.||2:A reagent of known concentration is dripped (or titrated, to use the term of art) into the unknown solution in the presence of an appropriate indicator molecule (for example litmus , in the case of a reaction between an acid and an alkali).||3:When the tipping point comes, and all of the unknown reagent has reacted, the solution changes colour.||4:The unknown concentration can then be calculated from the amount of known reagent used.

||1:滴定法（为了给那些在化学课上打过瞌睡的同学们提个醒）是一种计算溶质在溶液中的浓度的方法。||2:在某种特定的指示分子的参与下（例如，酸溶液和碱溶液的反应中我们使用石蕊指示剂），将一种已知浓度的溶液滴到（专业术语叫滴定）未知溶液中。||3:当滴定终点到来时，所有的未知溶液全都完成了化学反应，溶液的颜色就会发生变化。||4:然后未知溶液的浓度就可以通过被消耗掉的已知溶液的体积计算出来。

||1:To start with, when the level of cineole was low, possums preferred the first enclosure.||2:But as the drip of the titration went up, from 0% to 1% to 2% to 5% and ultimately to 10% of the food being cineole, their behaviour changed.||3:It was not quite the sudden shift from litmus red to blue of an acid being neutralised by an alkali, but it was not far off.

||1:开始桉树脑的浓度很低，袋貂都喜欢第一棵桉树。||2:但是随着滴定程度的上升，食物中的桉树脑含量从0%到1%到2%到5% 到最终的10%，它们的行为开始出现变化。||3:虽然不是完全像酸溶液完全被碱溶液中和时石蕊试剂突然从红变蓝那样迅速，但是也差不太多。

||1:In Dr Nersesian’s titration the litmus was a species called the brushtail possum.||2:The two reagents were predators and poisons.||3:In the wild, possums feed mainly on eucalyptus trees.||4:Feeding in trees this way also keeps them safe from ground-based predators, such as foxes.||5:They frequently have to shift from tree to tree in search of non-poisonous leaves, though, because a tree that is being browsed starts manufacturing toxins.||6:Dr Nersesian reasoned that there is probably a measurable point at which a plant becomes so toxic that possums prefer to take their chances with the predators on the ground—and she realised this was a perfect opportunity to do an ecological titration.

||1:涅尔谢相博士的滴定实验中的"石蕊指示剂"是一种叫帚尾袋貂的动物。||2:那两种溶液是"猎食者"和"有毒物"。||3:在野生环境下，袋貂主要以桉树叶为食。||4:生活在树上也能让它们安全地远离地面上的那些猎食者——例如狐狸。||5:但是他们还得经常从一棵树上换到另一棵树上去寻找那些没有毒的叶子。因为一颗树如果被它们吃久了就会自动分泌毒素。||6:涅尔谢相博士认为可能当植物中的毒素达到一个量值的时候，袋貂会选择冒着被猎食的风险（途经地面换一棵树觅食），然后她就意识到这是一个应用生态滴定法绝好的机会。

In Dr Nersesian’s titration the litmus was a species called the brushtail possum. The two reagents were predators and poisons.

涅尔谢相博士的滴定实验中的“石蕊指示剂”是一种叫帚尾袋貂的动物。那两种溶液是“猎食者”和“有毒物”。

It was not quite the sudden shift from litmus red to blue of an acid being neutralised by an alkali, but it was not far off.

虽然不是完全像酸溶液完全被碱溶液中和时石蕊试剂突然从红变蓝那样迅速，但是也差不太多。

Water solutions of all acids can turn a certain natural dye, called litmus , from blue to red.

（非限制性定语）所有酸的水溶液，都能使称之为石蕊的某一种天然燃料由蓝变红。（联系。

Obama was careful to say that he would impose no litmus test on potential nominees.

奥巴马谨慎的说他不会在潜在被提名人中进行试金石测试。

But the litmus test for commodities will be whether the broader economy shows enough vigor to support demand.

但最后的检验将来自于更大范围内的经济状况是否已有足够的活力来支持需求。

When making decisions about the future, we naturally use events from the past as litmus tests.

当我们做出有关未来的决定时，自然地我们用过去的事件作为”试金石“。

litmus red

n.石蕊红

litmus whey

n.石蕊乳清

litmus milk

n.石蕊乳

litmus test

n.决定性的试验,严峻的考验,石蕊试验

litmus blue

石蕊蓝

litmus paper

n.石蕊试纸,酸碱度试纸

litmus powder

石蕊粉

litmus tincture

石蕊酊

litmus testpaper

石蕊试纸

red litmus paper

红色石蕊试纸

litmus milk test

n.石蕊乳试验

blue litmus paper

蓝色石蕊试纸

litmus lactose agar

n.石蕊乳糖琼脂

litmus nutrose agar

n.德-康二氏培养基

litmus mannite agar

n.石蕊甘露醇琼脂

litmus red testpaper

红色石蕊试纸

litmus red test paper

n.红色石蕊试纸

litmus blue test paper

蓝色石蕊试纸

litmus coloring matter

n.石蕊色素

litmus milk enrichment

n.石蕊乳增富

lactose-litmus gelatin

n.乳糖石蕊明胶

litmus neutral test paper

n.中性石蕊试纸

litmus milk enrichment method

n.石蕊乳增富法

chalk blood yeast dextrose litmus milk

白垩、血、酵母浸膏石蕊牛乳(培养基)

drigalski-conradis litmus nutrose agar

n.德-康二氏石蕊钠酪蛋白琼脂