buns怎么是屁股，的意思啊，晕晕晕，包子到底该怎么说

steamed stuffed bun 包子
麦当劳汉堡包上下面的面包也叫bun

例句与用法:
1. I bought some buns for tomorrow's breakfast.
我买了几个圆面包当明天的早餐。

2. The chocolate coating has all been licked off the cream buns.
奶油小面包外面的一层巧克力都被舔光了。

3. Do you prefer to have rice or buns?
你愿意吃饭还是吃馒头。

4. I'll plump for noodles rather than buns.
我要吃面条而不要吃馒头。

buns不是屁股是馒头，屁股是buttocks
包子Steamed stuffed bun，雅虎说的