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VOA慢速英语:美国飞机事故后下令检查发动机
2018-04-20来源:和谐英语
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debris –n. the pieces that are left after something has been destroyed
blade –n. one of the flat spinning parts that are used in some machines that push air, such as jet engines
fatigue –n. weakness caused by stress in living or mechanical materials
occur –v. happen