Can make in gestation mammary gland gets sufficient growth, make mammary gland flocculus eventually end conduit development becomes glandule bubble, make good preparation for lactation.
在娠期可使乳得到充分发育,使乳小导管发展成为小泡,为哺乳作好准备。
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The mammary glands are common to the whole class of mammals, and are indispensable for their existence; they must, therefore, have been developed at an extremely remote period, and we can know nothing positively about their manner of development.
乳腺是所有哺乳动物共有的, 是它们生存所不可或缺的;因此,它们一定是在极其遥远的时期发展起来的, 我们对它们的发展方式一无所知。