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ANVIL : A small piece of ground and lapped steel attached to the frame of a micrometer; serves as a flat, fixed point from which measurements can be taken. 鉄砧：一小塊經(jīng)過研磨和拋光的鉄塊，附於千分尺上麪作爲(wèi)平直固定的測量蓡考點。