nipple
[ˈnɪpəl]
n.
乳头;
(奶品的)橡皮奶头;
(枪炮的)火门;
[机]喷灯喷嘴,螺纹接套;
例句:
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Nipple clamps, group sex and swingers' clubs.
来自BBC
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Strict adherence to nipple hygiene is essential during breast feeding.
在哺乳期要严格保持乳头的清洁卫生.
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The nipple is surrounded by pigmented circular skin called the areola.
乳头周围颜色较深的部位称为乳晕.
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Nipple inversion is quite common in normal breasts.
乳头内陷在正常乳房中也很常见.
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When that happens, the nipple is not healthy.
来自VOA
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Then again, I knew more synonyms for 'nipple.
来自WSJ