Having checked the address carefully, Tom clicked the button and sent the email to his professor.
在仔细地检查了地址后，汤姆点击了按钮，把邮件发给了他的教授。
Tom was tugging at a button-hole and looking sheepish.
汤姆拽着一个钮扣孔，一副害羞的样子。
Tom replaced the button mechanism in the machine.
汤姆换掉了机器上的按钮装置。
Tom replaced the button mechanism in the machine.
汤姆换掉了机器上的按钮装置。
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