凡事三思而后行
Look before you leap
以上为机器翻译结果，长、整句建议使用 人工翻译 。
我的妈妈给我买了一份礼物，那是一台电脑，我很开心，她说既然我已经十八岁了，就要成熟点，凡事要三思而后行。
My mother gave me a present, it was a computer, I was so happy, she said that since I had been 18, I should be mature, I should think twice before action.
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