o’clock
adverb/əˈklɒk/
/əˈklɑːk/
- used with the numbers 1 to 12 when telling the time, to mean an exact hour
（表示整点）…点钟 - He left between five and six o'clock.
他是五点到六点之间离开的。 - at/after/before eleven o’clock
十一点整／后／前
- He left between five and six o'clock.