| 单词 | litmus test |
| 释义 | litmus test (once / 34062 pages) n In chemistry, a litmus test is used to find out if a solution is an acid or a base. A special kind of paper is dipped in the liquid being tested during a litmus test. A scientific litmus test can tell you the pH of a gas or liquid — in other words, it shows exactly how acidic the substance is. A litmus test uses litmus paper to test the substance; it turns red if it's acidic and blue if it's alkaline, or basic. The term litmus test is also used to talk about a simple, decisive test of something: "The vote was a litmus test of the voters' feelings about the economy." WORD FAMILYlitmus test: litmus tests USAGE EXAMPLES“Merry Christmas” is an expression of goodwill, not a litmus test for determining who does, or does not, support a Christian religion. Washington Post(Dec 28, 2016) Specificity would still be needed for, say, pollution discharge limits, but the litmus test should be whatever achieves the desired results. Washington Post(Dec 13, 2016) The next few years, and the rise of a new generation of filmmakers, will be the litmus test for the arrival of streaming. The New Yorker(Dec 06, 2016) 1n a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator Syn|Hyper litmus acid-base indicator an indicator that changes color on going from acidic to basic solutions 2n a test that relies on a single indicator her litmus test for good breeding is whether you split infinitives Hyper exam, examination, test a set of questions or exercises evaluating skill or knowledge |
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