英语词汇“keystone mill”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	keystone mill
释义	> as lemmas keystone mill † keystone mill n. Obsolete rare a kind of mill used for grinding bark for tanning. ΚΠ 1881 Spons' Encycl. Industr. Arts IV. 1227 The well known American ‘keystone’ mill, in which the preliminary breaking is accomplished by the arms A; the bark is then finely ground by the toothed cones N. extracted from keystonen.¹adj. < as lemmas
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