学生们在做实验前分成四组。
The students were into four groups before doing experiments.
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。
In 1856, William Perkin, an 18-year-old science student, noticed something strange while doing an experiment.
我班上的孩子们正在做实验。
他们在做实验阻止老鼠繁殖。
有人看见老教授深夜还在做实验。
The old professor was seen making an experiment late at night.
当她在做实验时，她的头发着了火。
他在做实验时想到了一个绝妙的主意。
正在做实验的那个学生是我们的班长。
在做实验时，你必须小心地使用仪器。
In doing experiments, you must be more than careful with the instruments.
我想他们此时并不在做实验。
I don't think they're carrying out experiments at the moment.
在做实验时要注意什么呢？
当他在做实验时，他观察到这个物理现象。
As he was making his experiments, he observed this physical phenomenon.
我能体会到一个心理学家在做实验的感觉。
I can experience the feelings of a real psychologist doing the experiment.
我们在做实验时，注意到一种奇怪的现象。
While (we were) doing the experiment, we noticed something strange.
他们也正在做实验。
他们在做实验吗？
（强调宾语）我父亲昨晚在实验室里是在做实验。
It was the experiment that my father did in the lab yesterday evening.
我们在做实验。
他们在做实验。
我正在做实验。
在做实验时，不能过分依靠人类的感觉去做精确的观察。
When experiments are to be made, one cannot rely too much upon the human senses to make accurate observation.
在做实验时，不能过分依靠人类的感觉去做精确的观察。
When experiments are to be made, one cannot too much upon the human senses to make accurate observation.
每次实验之前都有预习作业，而且必须在做实验前上交。
Each lab will be preceded by a prelab assignment that must be turned in before doing the lab work.
还不知道。他们仍在做实验，看看用新的药物能不能起作用。
No, they're still doing tests and trying to figure out new medications in the hope that something will work.
对于清华大学新闻与传媒专业、26岁的王晓亚而言，做脱口秀更像是在做实验。
However, for Wang Xiaoya, 26, a graduate student majoring in journalism and communications at Tsinghua University, making a talk show is like doing an experiment.
对于清华大学新闻与传媒专业、26岁的王晓亚而言，做脱口秀更像是在做实验。
However, for Wang Xiaoya, 26, a graduate student majoring in journalism and communications at Tsinghua University, making a talk show is like doing an experiment.
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