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-现代词典

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	gynomonoeciously gynomonoecism gynomonoecy gynopara gynoparous gynophore gynophoric gynosporangium gynospore gynostegium gynostemium gynotermone -gynous gynous gyns -gyns gynura -gyny gyny gyokuro gyp gyp gypaetus gyp corn gype

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