both 指两者都all指所有的each指每一个强调个体 every指每一天强调整体,所有的
both of them went to high school 两个人都上了高中all of them went to high school 所有人都上了高中they cost $35 each 每个35元the hotel assures every guest of personal attention 酒店会对每个顾客都用心照料看下例句吧