water-ballast

基本解释

In a water-ballast boat, a chamber in the bottom of the hull fills with water to provide this ballast.
在水压载的帆船上，船底的一个空间蓄满水以提供这种负载。
The paper discusses the design of the flow-through BW (i. e. ballast-water) system which is applied on ship.
本论文对船舶“溢流法”压载水系统设计进行了比较深入的研究。
All galvanization, stainless steel and other non-ferrous metal fittings in water ballast tanks should be protected during sand-blasting. If have damaged, should be renew.
镀锌件、不锈钢或其它有色金属材料的舾装件的保护工作，冲砂中避免损坏。若有损坏，须更换；

Call it the Das Boot effect: With their deep keels and heavy ballast, J-boats push such a mass of water that they tend to hunker down in a breeze, submerging the bow and stern and soaking practically everyone on deck.
FORBES: Magazine Article