at call
英
美
- at prep.在;向,朝;处于…状态;在…远;(用于速度、比率等)以,达
- call vt.呼叫;打电话;把...称为n.打电话;访问;召唤;呼叫;把...看作vi.呼叫;(短暂的)拜访
- The doctors in our hospital are at call day and night.
我们医院的医生随叫随到。
- He has a large number of reference books at his disposal.
他有大量的参考书可供使用。
- Airliners in service at present cannot fly faster than the speed of sound.
目前供使用的客运机飞行速度不能超过音速。