英语词汇“permanent ballast”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-现代词典

单词	permanent ballast
释义	permanent ballast permanent ballast A weight permanently installed on an aircraft to bring its center of gravity within specified limits. In some aircraft, fuel is used as a ballast. This fuel, however, cannot be consumed for use.
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