许多药物都是经过反复试验后才被发现的。

Many drugs were found by trial and error.

《柯林斯英汉双解大词典》

经过反复试验，我终于找到了正确的方法。

I finally found the right key after lots of trial and error.

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经过反复试验，我终于找到了正确的方法。

Finally I found out the right way over repeated trials.

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经过反复试验，我终于找到了正确的方法。

I find the right way after many trials.

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(英译汉)他们经过反复试验才最终取得成功。

It was only after many tries that they finally succeeded.

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(英译汉)他们经过反复试验才最终取得成功。

It was only after many tries that they finally succeeded.

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