并得出欧洲法规和美国法规在头部碰撞区域的定义上基本相同，但是在免检区域以及撞击点和撞击角度的确定上有很大的差别。

Including the confirmation of the head impact areas, the determine of the exemption areas, the selection of head impact points, the ascertain of the impact points and impact angle.

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鉴于太空中的物质很多，而地球周围的区域则有限，政府希望减少发生碰撞的机会。

With so much stuff in space, and a limited area around our planet, the government wants to reduce the chances of a collision.

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这包括运行轨道要高于或低于现有铁路以避免平交道，与其他区域隔离以免与行人、动物、公路车辆碰撞。

This includes running tracks above or below roadways to avoid railroad crossings and fencing off areas to avoid collisions with animals, people and road vehicles.

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