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。

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.

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“潜入诱饵球中非常危险。海豚高速度冲入，总会发生危险的冲突。”他说。

Diving in a bait ball is very dangerous. Dolphins are charging at high speed and there is always danger of clash, "he said."

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因此，计算筒体尤其是其危险部位的应力，预测其裂纹扩展速度或其使用寿命，具有非常重要的实际意义。

Accordingly, it is very important and significant to calculate the stress of the cylinder especially in the dangerous position, and to predict its crackle expanding speed and its surplus life.

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