stepping-stone
名词 n.
英文释义
名词 n.
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Alternative form of stepping stone.
— As I have said, it is not the intention of the Bundesbahn to use the diesel as a stepping-stone between steam and electric traction—a policy which, in the light of the excellent results obtained with modernised steam locomotives, it regards as uneconomical and unnecessary.
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数据来源: Wiktionary