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trial and error

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释义
反复试验，不断摸索；试错
The process of finding a solution to a problem by trying many possible solutions and learning from mistakes until a way is found.

例句
Milton:You didn't bleed out?
Hershel:We have good people.They took care of me.
Milton:Doctors?
Hershel:No.We learned by trial and error.（The Walking Dead）
米尔顿：你没有失血过多吗？
赫谢尔：当时有一些懂医术的人，他们悉心照料我。
米尔顿：是医生吗？
赫谢尔：不是，我们靠实践不断试错，摸索出来的。（行尸走肉）