butt-welded rail ends是什么意思，butt-welded rail ends的翻译，butt-welded rail ends音标、读音、用法和例句

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butt-welded rail ends是什么意思，butt-welded rail ends的翻译，butt-welded rail ends音标、读音、用法和例句_魏碑心思朗文词典