船舶碰撞距离直接影响船舶碰撞危险度的大小。
The collision distance of a ship with another affects ship's collision risk index (CRI) directly.
数值结果表明，在碰撞距离附近，压缩比显著增加。
Numerical results show that the squeezing ratio largely increase at the nearby of collision distance.
如果 NGC 4258 的中心是一个星团，恒星之间的距离会非常近，以至于在很久以前单个恒星之间的碰撞就会把星团撕裂。
If the center of NGC 4258 were a star cluster, the stars would be so closely spaced that collisions between individual stars would have long ago torn the cluster apart.
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