Interbreeding Common Among Various Types of Humans?

几种不同的人类物种之间杂交是普遍现象吗？

Such interbreeding is usually limited because the offspring are sterile.

这种异种杂交是非常有限的，因为他们的后代是不育的。

The progeny of interbreeding start with a big evolutionary disadvantage.

杂交后裔一开始在进化上处于极大的劣势。

It could be just 50 Denisovans interbreeding with a thousand modern humans.

他说：“可能只是50个Denisovan人和1000个现代人杂交。”

Prolonged interbreeding in any species can eventually lead to serious birth defects.

长期来看，任何物种间的异血缘繁殖终会导致严重的先天缺陷。