buttocks 

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英汉解释

n. 臀部；纵剖线（buttock的复数）
v. 用过背摔摔出对手（buttock的第三人称单数）

同义词

n. derriere，fanny，fundament，hind end

参考例句

1. Small white or red bumps on the buttocks are most likely keratosis pilaris.
屁股上起的或白或红的小肿块最有可能是毛发角化病。
2. If buttocks touch chair, it is not only no tasteful, but also no benefit to body's curve. In fact, you are widening your buttocks.
要是用臀部来就椅子，这种坐法不但很不雅观，同时对于身体的曲线也毫无补益，事实上，你是在加宽你的臀部。
3. Therefore the mature feminine abundant rhyme's buttocks bring the actual feeling must by far strong from esthetics angle analysis.
所以成熟女性丰韵的臀部带来的实际感觉要远远强于从美学角度的分析。

英英解释

n.
  1. the fleshy part of the human body that you sit on

网络释义

buttocks
臀部; 屁股; 船艄凸面 臀部; 屁股蛋;
peach buttocks
松下桃香;
Buttocks blooms
屁股开花;
Buttocks Pillows
来自日本的屁屁枕;
cross buttocks
夹头过背摔：;