Objects, like bits of old space rockets or satellites, move around the planet at very high speeds, so fast that even a very small piece can break important satellites or become dangerous to astronauts.
一些物体，比如一些旧的太空火箭或卫星碎片，在地球上以非常高的速度运动，速度如此之快，以至于一个非常小的碎片都能破坏重要的卫星或对宇航员造成危险。
Children mustn't play with dangerous objects like sharp knives or scissors.
小孩子不可以玩危险的物品，例如锐利的刀子或剪刀。
Do not jump in your seat, stand, throw objects or engage in other dangerous actions.
请保持坐姿欣赏节目；请勿在座位上跳跃、站立、抛物及做其他危险动作。
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