1. point of departure
   n.[海]开航点,出发点
   
2. departure time
   出发时间，撤离时间，起飞时刻
   
3. time of departure
   【化】 发送时间
   

1. A parenthetical departure;a digression.
   离题话;插入语
2. The date of his departure is uncertain.
   他离开的日期尚未确定。
3. He took an abrupt departure.
   他突然离去。
4. They were poised for departure.
   他们为出发做好了准备。
5. Her departure was the occasion of much sadness.
   她的离别是令人十分悲伤的起因。

　3个名词解释