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by trial and error 通过试错
英文释义
To solve a problem by trying many different possible solutions, experimenting with one after another, until the correct answer is found.
例句
I found an old locked chest in my grandfather's house and a bag of keys, so by trial and error I tried each key until I found the one key which opened the chest.
我在祖父的房间里发现了一个锁住的箱子和一包钥匙，我采取试错的方法，用每把钥匙试开，直到其中一把打开了箱子。
