哺乳动物繁衍后代时不是卵生，而是胎生。
Mammals don't lay eggs. They give birth to live babies.
youdao
对哺乳动物来说，卵生和长有毒刺是很少见的。
It is very unusual for a mammal to lay eggs or to have poisonous spurs!
它们也是卵生的。
They laid eggs too.
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