water ballast
noun
Water carried in a tank or compartment and used as ballast on a boat or ship, or (later) an aircraft.
Origin
Mid 18th century; earliest use found in The Gentleman's Magazine.
| 单词 | water ballast |
| 释义 | water ballastnoun Water carried in a tank or compartment and used as ballast on a boat or ship, or (later) an aircraft. Origin |
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