Ⅰ. both “两个都” 而each则强调“各个”如：
① Both of us won a prize. 我们两人共同赢得了一个奖。
② Each of us won a prize. 我们每个人都赢得了奖。
Ⅱ. both 用作句子主语时，谓语总是复数，如：
① Both these books are mine.
而each常用单数。但在下列情况下用复数，即它在复数名词或代词之后。如：
①They each have beautiful stamps.
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