名词
中文翻译：初级乳突
同义词：
['primary nipple', 'primary lobule例句：1. The primary villus is the first part of the mammary gland that develops during pregnancy.（初级乳突是乳腺腺体发育过程中的第一个部分。）']
例句：
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1. The primary villus is the first part of the mammary gland that develops during pregnancy.
初级乳突是乳腺腺体发育过程中的第一个部分。
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2.During puberty, the primary villus begins to grow and mature.
青春期时，初级乳突开始生长和成熟。
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3.In some species, the primary villus can be a significant source of milk production.
在某些物种中，初级乳突可以是一个显著的产奶来源。