事故: malfunction; trouble; fault; failure; mistake; accident; mishap 短语和例子造成事故 bring about an accident; 减少事故 cut down accident; 预防事故 provide against accidents; 交通事故 traffic accident; 一次事故使他双目失明
叠: Ⅰ动词1.(一层加上一层; 重复) pile up; repeat 短语和例子层峦叠嶂 peaks rising one higher than another; 一个一个往上叠 pile one above another2.(折叠) fold 短语和例子把信叠好 fold the letter; 叠被子 fold up a quilt; 这些轻便折椅可以叠起来放进汽车。
