英语词汇“touch needle”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	touch needle
释义	touch needle noun : a small bar of gold either pure or alloyed with silver in a known proportion for trying the fineness of a gold or silver article by comparing the streaks made by the article and the bar on a touchstone
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