number与sum的区别:
number:是单指数字.例如3、33、333和103都是数字.number+s:才是数量,总数.置于数字之前表示号数,如No.3.等.
sum:是总数,总计.也可解为算术.例如 good at sums 是特长于算术.也可理解为[一笔]例如句内出现 sum at.或 sum out of 的字样时.
number与sum的区别thanks
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