...验 Through The Repeated Experiments ; By Iterative Trial 经过反复试验 After Repeated Tests ; Undergoes The Repeated Test 经反复试验 After Repeated Testing ..
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经过反复试验
After repeated experiments
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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.
youdao
Finally I found out the right way over repeated trials.
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