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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. 鐵砧：一小塊經(jīng)過(guò)研磨和拋光的鐵塊，附于千分尺上面作為平直固定的測(cè)量參考點(diǎn)。