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1·Some indulge themselves on the internet and willingly degenerate(degraded) from day to night; some even commit theft or racket so as to make a blunder.

有的沉迷于网络之中，日日夜夜自甘堕落；有的去偷窃或敲诈，犯下大错。

2·Apologize when you commit a mistake or a blunder.

当你犯错或者做错决策的时候，向他道歉。

3·Commit (make) a blunder.

犯了大错。