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1. The National Transportation Safety Board says a preliminary exam shows evidence of metal fatigue on the Southwest Airlines jet engine that blew apart amid air.
metal fatigue 金属疲劳
Do not let mattress locally under weight, avoid prolonged standing or let their kids jump on the mattress in order to avoid local compression, resulting in metal fatigue, impact resilience.
不要让床垫局部受力过重，避免长期站立或让小孩在床褥上跳跃，以免局部受压，致使金属疲劳，影响弹力。
2.The plane made an emergency landing in Philadelphia.
emergency 紧急的
Orman received emergency treatment from medics on the pitch.
奥曼在球场上接受了医务人员的紧急治疗。
