Many animals display maternal instincts only while their offspring are young and helpless.
许多动物在其幼崽弱小无法自助时都显出了母性的本能.
《现代英汉综合大词典》
This study also found no association between SSRI exposure and maternal weight gain.
这项研究也发现在SSRI暴露和母亲体重增加之间没有关联.
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这种绒毛合体滋养细胞层直接与母体血液接触成为胎盘屏障.
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和超声波一样, 产妇血清筛选是早期诊断胎儿畸形的最初手段.
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Factors that can affect the placenta include maternal high blood pressure, stress and smoking.
影响胚盘的因素包括母体的高血压 、 压力和吸烟.
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