o'clock
adv.美 /əˈklɑk/英 /əˈklɒk/
……点钟
used after a number to show the hour
例句
School starts at eight o'clock every morning.
学校每天早上八点开始上课。
Let's meet at three o'clock by the library gate.
咱们三点钟在图书馆门口见吧。
怎么记
o（零）+ clock（钟）→整点报时
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