as and when
01
根据需要, 在必要时
used to express the idea of something happening or being done at the appropriate or necessary times
例子
We will hire new employees as and when the need arises.
我们将在需要时适时雇佣新员工。
The system automatically updates itself as and when new information becomes available.
系统一旦有新信息可用，就会自动更新。
