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He has done it by exploring, by experimenting, by trying it out and seeing whether it works, by gradually changing it and refining it until it does work.

他不断探索、实验、尝试并检验成效，不停修改、改进，直到它能顺利运行。

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"Why should we do something when we've already done it?" But he recognizes that some people have strong feelings about the issue.

VOA: special.2010.04.28

I had made him know that I felt he was cruel and I had done it without his punishing me.

同时，我让他感到了自己的残忍,对此他无能为力。

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because you've already done it or you don't need to do something because you've already done it before.

因为你之前已经做过，或者你觉得因为之前做过就没有必要再做了。

I've already 课堂 - SpeakingMax英语口语达人

But those that have done it say the experience is more than worth it.

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"But I knew why they had done it, " the 37-year-old unemployed marketing manager says.

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Now, finally, we have done it and it's one of the nicest races and feelings.

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