名词
中文翻译：乳管
同义词：
['mammary duct', 'milk duct']
例句：
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1.The mammary ducts are responsible for the production of milk in the mammary glands.
乳腺导管负责乳腺腺体产生奶。
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2.During pregnancy, the mammary ducts expand to allow for the growth of the fetus.
怀孕期间，乳腺导管扩张以允许胎儿生长。
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3.The mammary ducts are lined with specialized epithelial cells that secrete milk proteins.
乳腺导管内衬有特殊的上皮细胞，分泌奶蛋白。