o'clock

剑桥词典

used after a number from one to twelve to say the time when it is exactly that hour
（用于数字1至12后表示整点）…点钟
It's two o'clock. 两点钟了。
He called me at four o'clock in the morning . 他凌晨4点打电话给我。

例句

• Make sure you're there by five o'clock.
• I always get up at six o'clock.
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