o'clock

劍橋詞典

used after a number from one to twelve to say the time when it is exactly that hour
（用於數(shù)字1至12後表示整點）…點鍾
It's two o'clock. 兩點鍾了。
He called me at four o'clock in the morning . 他淩晨4點打電話給我。

例句

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