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.
海运船舶的活动也会对于环境造成有害的污染，包括船上废水处理、船底排水泵、油罐清洗、压舱、发电机和燃料等。
The activities of maritime vessels that can be environmentally harmful include ship waste disposal, bilge pumping, tank cleaning, ballasting, power generation, and fueling.
海运船舶的活动也会对于环境造成有害的污染，包括船上废水处理、船底排水泵、油罐清洗、压舱、发电机和燃料等。
The activities of maritime vessels that can be environmentally harmful include ship waste disposal, bilge pumping, tank cleaning, ballasting, power generation, and fueling.
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