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1.seat belt 安全带
例句：Ask someone to wear a seat belt and they laugh at you.
当你要求某个人系上安全带时，他们会嘲笑你。
2.buckle up 把…扣紧
例句：He won't start the car until we've all buckled up.
他直到我们都扣上安全带才开车。
3.leading cause 主要原因
例句：Depression is the leading cause of suicide.
抑郁症也是自杀的主要原因。
4.emergency department 急诊室
例句：We see the manifestationsof obesity in the emergency department.
在医院的急诊科我们可以看到肥胖症的表现。
