1、The platypus is an example of an aplacental mammal.
鸭嘴兽是无胎盘哺乳动物的一个例子。
2、Aplacental mammals have a different method of providing nutrients to their young.
无胎盘哺乳动物有一种不同的方式来提供给它们的幼崽营养。
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