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。
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。
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。
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