Czeisler博士说：研究显示有30%到50%的夜班工作人员一周至少有一次会在工作中睡着。
Czeisler said studies show that 30 percent to 50 percent of night-shift workers report falling asleep at least once a week while on the job.
暮色渐深，夜班工作人员拿来了更多的毯子和热水瓶给我们保暖，还端来了几大杯可可茶，来得正是时候。
As the twilight deepened, the night-staff brought extra blankets and hot-water bottles to keep us warm and large welcoming mugs of cocoa.
暮色渐深，夜班工作人员拿来了更多的毯子和热水瓶给我们保暖，还端来了几大杯可可茶，来得正是时候。
As the twilight deepened, the night-staff brought extra blankets and hot-water bottles to keep us warm and large welcoming mugs of cocoa.
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