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	tallowweed tallowwood tallowy tall redtop tall ship tall sisymbrium tall speedwell tall thistle tall timber tall wheatgrass tall white lettuce tallwood tally tally tally board tally card tally clerk tallygalone tallyho tallyman tally sheet affectionately affectioned affectionis affective

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