on call片语

待命、随叫随到

She is on call every other weekend at the hospital.

她每隔一个周末都要在医院待命。

随时可支取、通知即付金融

The bank keeps part of the funds on call for emergencies.

银行把部分资金设为随时可支取，以应急需。

待命的、随叫随到的

The building has an on-call engineer available around the clock.

这栋大楼有工程师全天候待命。