介绍了断裂力学在火箭推进剂贮箱安全评定中的应用。
An application of fracture mechanics to the safety evaluation of rocket propellent tank was presented.
而有些卫星则装配了火箭发动机和推进剂贮箱，这样可以控制它们的坠落路线，将其引导坠落到海洋之中，而不是坠落到居民区里。
Some satellites come equipped with a rocket engine and propellant tank so controllers can aim their descent into an ocean instead of a neighborhood, but not all.
而有些卫星则装配了火箭发动机和推进剂贮箱，这样可以控制它们的坠落路线，将其引导坠落到海洋之中，而不是坠落到居民区里。
Some satellites come equipped with a rocket engine and propellant tank so controllers can aim their descent into an ocean instead of a neighborhood, but not all.
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