[mass noun]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。 ■[count noun]a particular point or period of time when something happens 发生时刻(或时段) ■(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