a sum of 与a quantity of 区别
a sum of 释义： 一笔（修饰货币） 例句： You owe a certain person a sum of money. 你欠着某人一笔钱。 a quantity of 释义： 一些 例句： She carried a quantity of matches in an old apron, and she held a bundle of them in her hand. 她用一条旧围裙兜着许多火柴，手里也拿着一扎...
a sum of 释义： 一笔（修饰货币） 例句： You owe a certain person a sum of money. 你欠着某人一笔钱。 a quantity of 释义： 一些 例句： She carried a quantity of matches in an old apron, and she held a bundle of them in her hand. 她用一条旧围裙兜着许多火柴，手里也拿着一扎...