Timing is a noun that refers to the choice, judgement, or control of when something should be done.
In different contexts, timing can mean:
1. The time when something happens (时机)
2. The ability to choose the right moment to do something (时机把握)
3. In mechanics, the regulation of occurrence of events (机械定时)
4. In sports, the coordination of movements with time (运动节奏)
5. In music, the tempo or rhythm (音乐节拍)