One way to achieve this is by doing an experiment.
能够实现这个目的的方法是做一个实验。
Mr. Black walked around and offered help while we were doing an experiment.
我们做实验时,布莱克先生四处走动并提供帮助。
In 1856, William Perkin, an 18-year-old science student, noticed something strange while doing an experiment.
1856年,18岁的理科生威廉·珀金在做实验时注意到一些奇怪的事情。
You make an observation doing an experiment that is as accurate as you can do.
得到了你能都,做到的最高精度。
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