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The outer breast consists of a nipple and areola. The tip of the nipple contains several hole openings allowing for milk to flow through during lactation. The areola is the pigmented area around the nipple. It is covered with Montgomery glands that secrete oil to lubricate the nipple and areola.
乳房的外部由乳头和乳晕组成。乳头的尖端包含几个洞，泌乳的时候乳汁从这里流出。乳晕是乳头周围的色素沉着区域。这个区域被蒙哥马利腺覆盖，它能分泌油类物质润滑乳头和乳晕。
The primary function of female breasts is to produce milk in order to nourish an infant, a process called lactation. The breasts, which are composed primarily of fatty tissue, also contain milk producing glands called lobules. Lobules are connected to the nipple by a network of tubes called milk ducts. The breasts produce milk from water and nutrients removed from the bloodstream.",
女性乳房的主要功能是产生乳汁，哺育婴儿。这个过程叫做授乳。乳房主要由脂肪组织构成，其内包含能产生乳汁的腺体—乳腺小叶。乳腺小叶通过叫做乳管的管道网与乳头相连。乳房从血液中摄取水分和营养产生乳汁。
