单词：annular placenta
annular placenta的用法和样例：
例句
- Earlier studies linked the placenta to the disease.早期的研究认为，该病与胎盘有关。
- Methamphetamine passes through the placenta and is secreted in the breast milk.甲基苯丙胺通过胎盘分泌在母乳中。
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