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.
通过工程师的设计，这款推进器同样能够让直升机完美地进行减速，也能通过装配遥控装置驾驶仪让控制X2的飞行更为容易。
According to the engineers, this propeller can also be used to slow the helicopter snappily. And computerised "fly-by-wire" controls allow the X2 to be flown relatively easily.
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