o'clock
US /əˈklɑːk/
UK /əˈklɑːk/

副词
1.
点钟
used after a number from one to twelve to indicate a particular hour when telling the time
示例:
•
It's three o'clock.
现在是三点钟。
•
The meeting starts at nine o'clock in the morning.
会议在早上九点钟开始。
在 Lingoland 学习这个单词