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A few days ago, the submarines came into contact at very low speed.
几天前，潜艇相撞时的速度非常低。
youdao
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They briefly came into contact at a very low speed while submerged.
它们主要是在潜入水中时低速接触彼此。
youdao
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They briefly came into contact at a very low speed while submerged.
它们主要是在潜入水中时低速接触彼此。
youdao