alarm clock
definitions
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a device that rings to wake someone up at a set timezh: 闹钟
examples
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I set my alarm clock for 6:30 AM every morning.
我每天早上把闹钟定在早上6点半。
I set my alarm clock for 6:30 AM every morning.
我每天早上把闹钟定在早上6点半。