所以，Cohen解释道，轮船需要在一个港口把海水泵进巨大的压舱水柜，然后在下一个港口再泵出去。

So, Cohen explains, ships fill massive onboard ballast tanks by pumping seawater in at one port and pumping it out at the next.

youdao

所以，Cohen解释道，轮船需要在一个港口把海水泵进巨大的压舱水柜，然后在下一个港口再泵出去。

So, Cohen explains, ships fill massive onboard ballast tanks by pumping seawater in at one port and pumping it out at the next.

youdao