合写成一个单词的 everyone (= everybody)只能表示“每一个人”，不能指物，后面不能接 of 介词短语;分开写成两个单词的 every one 既可以指人也可以指事物中的“每一个”，后面可以接  of 介词短语。

       以下是《朗文当代高级英语辞典》第6版对  everyone 和  every one 的用法说明（原文）：

      You use everyone when you mean "all of the people in a group". You write it as one word. everyone 表示某一群体中的所有人，不分写：Everyone enjoyed the concert.所有人都很享受这次演唱会。

      You use every one when you mean "every person or thing in a group, considered as separate people or things". You write it as two words. every one 则表示某一群体中所有独立的个体，要分写：There are no chocolates left - someone has eaten every one. 巧克力糖没有剩 —— 有人把它们都吃了。

      You say every one of a group of people or things. 后接一群人或一组事物时，要用 every one of ：I wish to thank every one of you. 我要感谢你们每一个人。Don't write 不要写作：everyone of