But early on he made a serious mistake.
但他早年时犯了一个严重的错误。
He made a serious mistake in spelling. Can you point it out?
他犯了一个宽峻的拼写弊端，您能指出去吗？
At this crucial juncture he lost his head and made a serious mistake.
就在这关键时刻，他头脑发昏，犯了严重的错误。
If I had been there, he would not have made such a serious mistake.
如果我在的话，他就不会犯这么严重的错误了。
Finally it came home sharply to him that he made such a serious mistake.
他终于痛切地认识到他犯了如此严重的错误。
He has made a serious mistake.
他犯了一个严重的错误。
He has made a serious mistake.
他犯了一个严重的错误。
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