there is a " u" in the world ruler.

问题描述:

there is a " u" in the world ruler.

以元音开头的单词泛指要加an,U这个字母不是以元音直接开头所以不用an,加a.关键看音标是否已元音开头,看字母不一定准,就像hour要加an.因为H不发音,还是元音开头