You can't be too careful in doing experiments.

你做实验要特别小心。

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We rely on them to be careful in doing experiments.

我们相信他们在作实验的时候是非常谨慎的。

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In doing experiments, you must be more than careful with the instruments.

在做实验时，你必须小心地使用仪器。

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Pieter Hoff says he is now doing experiments with twenty thousand Waterboxxes in countries including Pakistan, Ecuador and the United States.

VOA: special.2010.07.13

He was doing experiments in a gas discharge tube.

实验是在一个气体放电管中进行的。

麻省理工公开课 - 固态化学导论课程节选

He says to understand what the birds are doing and whether this sets them apart in any way, the same experiments need to be carried out, multiple times, on many different species, to properly compare results.

BBC: Meet the brains of the animal world

In both cases, the experiments would be tiny compared with what people are already doing.

ECONOMIST: Geoengineering

The researchers at Cern in Switzerland and Gran Sasso in Italy have tried really hard to find what they might be doing wrong - over three years and thousands of experiments - because they can hardly believe what they are seeing.

BBC: Light speed: Flying into fantasy