at call

英 美
  • 随叫随到;按通知;通知付款;
  • 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
    1. The doctors in our hospital are at call day and night.
      我们医院的医生随叫随到。
    2. He has a large number of reference books at his disposal.
      他有大量的参考书可供使用。
    3. 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。