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	spanish licorice spanish lime spanish lobster spanish mackerel spanish mahogany spanish measles spanish moss spanish n spanish needles Spanish oak spanish oak spanish ocher Spanish ocher spanish omelet spanish onion spanish oxide spanish oyster spanish oyster plant spanish pack spanish paprika spanish peanut spanish pear spanish pepper spanish plum spanish potato

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