o'clock
/əˈklɒk/adverb
1- used to specify the hour when telling the time…点钟：
the gates will open at eight o'clock.
大门8点钟开。
1.1
- used following a numeral to indicate direction or bearing with reference to an imaginary clock face, 12 o'clock being thought of as directly in front or overhead…点钟方向（或航向）（指以假设的平放或竖放的钟面时针为指示方向, 12点表示正前方或正上方 ）。