on的单词有哪些三年级

on开头的英文单词：

　　only唯一的; 仅有的;

　　once. 一次，一趟; 一倍; 曾经; 一旦;

　　onion洋葱(头)

　　online在线的; 联网的; 联机的;

　　one(数字)一; 一个; (基数)一，第一;

on开头的英文单词例句：

His house was the only settled home I had as a child.

他的房子是我儿时唯一固定的家。