a period of time when something (as a machine or factory) is functioning and available for use
例句
用作名词 (n.)
Let us use the timeliness of effective aware of their time to complete its work and the other for the modern pressure, provide a regular life routines to achieve LOHAS effect. 利用时效性让我们意识到自己要有效时间内完成工作，另一方面也为压力大的现代人，提供一定规律的生活作息，以达到乐活的功效。
To load cargo aboard a ship takes game time. 装船货在一个船舶上需要游戏运行时间。
The new bus service cuts the travelling time by half. 新的公共汽车交通服务使运行时间减少了一半。
美
['ʌpt'aɪm]
