“discoid placenta”的概念、定义、翻译、参考文献-科学参考

单词	discoid placenta
释义	discoid placenta Encyclopedia 农学排卵控制释 discoid placenta盘状胎盘绒毛逐渐集中于一个圆形的区域，呈圆盘状的胎盘。又称血液绒毛胎盘。
随便看	positive root positive root system positive rotation positive school of criminology positive selection positive self-adjoint operator positive self-regard positive semi-definite positive semi-definite form positive semi definite Hermitian matrix positive semi-definite Hermitian matrix positive semi-definite kernel positive semi definite matrix positive semi-definite matrix positive semi-definite operator positive semi definite quadratic form positive semi-definite quadratic form positive semi-definite rational function positive semigroup positive semiorbit positive semi-trough positive sense positive sense single-stranded RNA virus positive sequence positive series

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