英语词汇“ball signal”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	ball signal
释义	ball signal noun : an object like a ball hoisted manually to the top of a track-side pole in early railroading to indicate that the way was clear for an approaching train — compare highball
随便看	draegerman draff draffsack draffy draft draft draftable draft allowance draft chair draftee drafter drafter draft gear draft horse draftily draftiness drafting drafting drafting board drafting machine drafting race drafting table drafting yard draftman draftmanship

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