The young man spent as much time as he could doing the experiment.

那个年轻人花了尽可能多的时间来做这个实验。

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The young man was very nervous when he assisted at his first experiment.

那年轻人在参与他的第一次实验时十分紧张。

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The young man was very nervous when he assisted at his first experiment.

那年轻人在参与他的第一次实验时十分紧张。

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