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. 顯微鏡調節(微調可以對焦點非常清晰地顯示很多細節,粗調可以對焦點不太清晰地顯示細節。)
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 (科學實驗中的)對照組,對照物
Half of the control group suffered further heart attacks, compared with only 12% of those receiving the treatment. 對照組中,一半的人繼續遭受心髒病的折磨,而接受這種治療的人中這個比率只有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. 雙盲的(指在對兩組人進行比較的試驗中,被試驗者和科學家均不知道哪一組在接受測試)
the process of collecting and examining information about someone or something in order to get an accurate idea of what they are like (爲了解某人或某物的準確信息而進行的)調查