in ballast

基本解释

The emptying method is the most common application in ballast water exchange, but it is still not perfect so far.
排空法是船舶最常用的压载水更换方法，但目前这种方法还不尽完善。
The treatment system is designed to meet international standards that limit the number of living organisms in ballast water.
这套处理系统是按照国际标准设计的，可以限制压舱水中的生物含量。
Conventional inductance type ballast will be washed out as its so many disadvantages, so electronic ballasts are taking the dominant status in ballast market gradually.
而传统的电感式镇流器因其诸多弊病将被逐渐淘汰，电子式镇流器以其强大的优越性能正不断占据镇流器市场的主导地位。

But it goes further than that: Ivanka is now often put in the role of the ballast in a ship periodically tossed by waves created by her increasingly embarrassing father.
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Recent history also suggests REITS are not exactly ballast in down markets.
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Everybody knows you need fixed-income securities as ballast in a portfolio.
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