问题描述：
请教下面这句英语中 four score的意思：
Four score and seven years ago our fathers brought forth,upon this continent,a new nation,conceived in Liberty,and dedicated to the proposition that all men are created equal.
Four score and seven years ago our fathers brought forth,upon this continent,a new nation,conceived in Liberty,and dedicated to the proposition that all men are created equal.
问题解答：
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