be on call

更新日期：2026-08-14

词语	be on call
释义	be on call if someone such as a doctor or engineer is on call, they are ready to go and help whenever they are needed as part of their job〔医生、工程师等〕待命，随叫随到:•Don't worry, there's a doctor on call 24 hours a day.别担心，全天 24 小时都有一位医生值班。
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