介词短语
中文翻译：在整点
同义词：
['at the hour', 'at the exact hour', 'at the precise moment']
例句：
-
1. The clockis set to the hour of 9:00 every day.
时钟每天设定为9:00。
-
2. He arrived on the hour, just as the meeting began.
他准时到达，会议开始时正好。
-
3.She was on the hour when the bell rang for lunch.
铃响的时候她正好是午饭时间。