timing
/ˈtaɪmɪŋ/noun
mass noun
1- the choice, judgement, or control of when something should be done时间选择（或安排）; 时机掌握：
one of the secrets of cricket is good timing.
板球的秘诀之一就是掌握好时机。
1.1
- count noun a particular point or period of time when something happens发生时刻（或时段）。
1.2
- (in an internal-combustion engine) the times when the valves open and close, and the time of the ignition spark, in relation to the movement of the piston in the cylinder（内燃机的）定时, 正时, 计时; 同步。