英语词汇“ballast pocket”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	ballast pocket
释义	WordReference Random House Unabridged Dictionary of American English © 2024 bal′last pock′et, [Railroads.] Rail Transporta depression that is formed beneath the ballast layer by penetration of ballast particles into the subgrade and that tends to collect moisture.
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