名词
中文翻译：系统时钟
同义词：
['computer clock', 'computer timer', 'computertiming']
例句：
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1. The ATsystem clock is used to measure the timein a computer system.
AT系统时钟用于测量计算机系统中的时间。
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2. The engineer used theAT system clock to set the time forthe project meeting.
工程师使用AT系统时钟为项目会议设置时间。
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3. TheAT system clock was accurateenough to serve as a backuptime source during power outages.
AT系统时钟足够准确，在停电期间可以作为备用的时间源。