baozi可数吗?

　　例句：

　　Ty asks how to defrost a hot dog bun.

　　泰问如何解冻热狗面包。

　　She wore her hair in a bun.

　　她盘了个发髻。

　　Her hair was tied severely in a bun.

　　她的头发简单地盘成了一个发髻。