We can never be careful enough (too careful) in doing such experiments.
做这样的实验，我们越仔细越好。
They were already doing their experiments this time two days ago.
两天前的这个时候，他们就已经做着实验了。
They were doing their experiments from eight to eleven yesterday.
铃响时，他们已经做上实验了。
He is capable of doing these experiments.
他能做这些实验。
Two LABS doing the same experiments may get totally different results and never know why.
做相同实验的两个实验室可能获得完全不同的结果却不明所以。
The students are doing the experiments carefully in the lab now.
同学们现在正在实验室里认真地做实验。
The students are doing the experiments carefully in the lab now.
同学们现在正在实验室里认真地做实验。
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