一个带闹钟的收音机只卖十美元。
考试时不允许带闹钟，但是在家你可以给自己设定做一道题目的时间是两分钟，尽量在这个时间之内完成题目。
You can't do this in an exam, but at home you could set the alarm (on your phone) for 2 minutes and try to do each question within this time.
他坐在床上环顾四周，带定时功能的收音机闹钟钟面一片空白，因此，他知道昨夜一直没有来电。
He sat up in bed and looked around him. The face of the clock radio was blank, so the electricity must still have been down.
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