1
have nice buns
常用于称赞或追求身材。
He works out every day to have nice buns.
他每天都在锻炼，为了拥有好看的臀部。
臀部（俚语）
先理解核心含义，再看它在真实句子里的用法。
臀部（俚语）
the fleshy part of the human body that you sit on; buttocks
He works out every day to have nice buns.
他每天都在锻炼，为了拥有好看的臀部。
He fell off his bike and landed right on his buns.
他从自行车上摔下来，屁股直接着地。
After sitting on the hard bench for hours, my buns were sore.
在硬板凳上坐了几个小时后，我的屁股很疼。
The toddler waddled around in his diaper, showing off his little buns.
那个蹒跚学步的孩子穿着纸尿裤走来走去，露出他的小屁股。
常用于称赞或追求身材。
He works out every day to have nice buns.
他每天都在锻炼，为了拥有好看的臀部。
俚语，表示‘别坐着不动’。
You've been sitting all day; get off your buns and take a walk.
你坐了一整天了，起来走走。
俚语，意为‘赶快’。
Move your buns or we'll be late!
快点，不然我们要迟到了！
Not this
I ate two bun for breakfast.
Use this
I ate two buns for breakfast.
buns 是可数名词复数形式，表示多个小圆面包时必须加 -s，单数 bun 不能表示复数。
Not this
I slipped and hurt my bun.
Use this
I slipped and hurt my buns.
在俚语中表示臀部时，通常使用复数形式 buns，单数 bun 不表示这个意思。
Not this
I need to buy buns for sandwiches.
Use this
I need to buy bread for sandwiches.
buns 特指小圆面包，而三明治通常使用切片面包（bread），除非特别指定用圆形面包做三明治，否则使用 bread 更恰当。
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When meaning 'buttocks', used only in plural form; as 'small bread rolls', it is the plural of 'bun'.
Dictionary facts from ECDICT, WIKTIONARY.