名词
中文翻译：半钟
同义词：
['semi-chronometer', 'half-timer']
例句：
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1.The clock was set for half an hour before the meeting.
会议开始前半小时，时钟就停了。
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2.He had to wait for half an hour before he could see the results.
他等了半个小时才能看到结果。
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3. I'll need a half-hour to finish this project.
我需要半小时来完成这个项目。