计算是一件危险的事：硬盘终会当掉，用户也会不留心删掉文件。
Computing is risky business: all hard drives will fail eventually, and people accidentally delete files.
我不留心弄坏了玛丽的钢笔，出于报复，她扔了我的手机。
I broke Yajie's pen by accident, and in revenge she throw away my cellphone.
我不留心弄坏了玛丽的钢笔，出于报复，她扔了我的手机。
I broke Yajie's pen by accident, and in revenge she throw away my cellphone.
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