If a worker such as a doctor is on call, he or she is available to work or make official visits at any time when needed.(医疗从业者的)听候召唤,待命
used to describe workers who are available to make official visits at any time when they are needed(工作人员)随叫随到的,待命的
relating to the work of someone who is available at any time when needed(工作)需要所叫随到的,随时待命的
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