sciencethe way in which you focus a microscope. Fine adjustmentgives you a focus that shows a lot of detail very clearly , and coarse adjustmentgives you a focus that does not show so much detail clearly. 显微镜调节(微调可以对焦点非常清晰地显示很多细节,粗调可以对焦点不太清晰地显示细节。)
a method of finding out which different gases or liquids are included in a mixture by passing it through or over substances that absorb the different parts at different rates
[C]sciencea group of people or things that is compared with the people or things being used in a scientific test in order to show whether the test has an effect or not (科学实验中的)对照组,对照物
Half of the control group suffered further heart attacks, compared with only 12% of those receiving the treatment. 对照组中,一半的人继续遭受心脏病的折磨,而接受这种治疗的人中这个比率只有12%。
a double-blind test involves two groups of people, only one of which is really being tested. None of the people in the two groups and none of the scientistsperforming the test knows which people belong to each group. 双盲的(指在对两组人进行比较的试验中,被试验者和科学家均不知道哪一组在接受测试)
the process of collecting and examining information about someone or something in order to get an accurate idea of what they are like (为了解某人或某物的准确信息而进行的)调查