There are four physiotherapists on call at the sports injury clinic.在运动损伤诊所内有四名理疗师在值班。I was on duty morning, noon, and night.我白天黑夜地在值班。One corporal and four men were on escort duty.一名下士和四名士兵在值班护卫。Some of the crew were sleeping, while others were on watch.一些船员在睡觉，其他的在值班。