While such collisions are uncommon, nuclear expert John Large said such boats often ply the same waters.
虽然这种碰撞是罕见的，核专家约翰表示，这样的大型潜艇只往往在同一水域航行。
Laurence Waters visited us in place of John Trethewy who was unfortunately ill.
劳伦斯·沃特斯代替不幸生病的约翰·特雷休伊来拜访我们。
Laurence Waters visited us in place of John Trethewy who was unfortunately ill.
劳伦斯·沃特斯代替不幸生病的约翰·特雷休伊来拜访我们。
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