1. Time + 前后 / 左右
2. You can put 前后 / 左右 after a specific time to talk about the approximate time.
3. Noun(Event) + 前后
4. N + [Measure Word] + 左右
5. 左右 can be used for both a specific time and a time interval.
6. 左右 cannot be used after a defined period of time with the beginning and the end.
7. N + 岁 + 上下/左右
8. Both 上下 and 左右 can be used to indicate the approximate weight and height.
