定时间

• fixed time interval

例句

1. 在某一特定时间内，有关文件变化的一种记录。
   A record of changes in a file made at a particular time.
2. 商业中心已划为专门区域；送货车辆只在特定时间才能出入该地区。
   The commercial center has now been zoned off: delivery vans may only enter and leave at specified times.
3. 那个男孩只用了规定时间的一半就迅速将试卷做完了。
   The boy whizzed through the examination in half the time allowed.