它们是国际物种繁殖计划的产物。
The cubs were born out of an international breeding program for endangered species.
这项技术对于在没有雌性存在的情况下保持物种繁殖具有重要作用。
Such a technique could be valuable for preserving species when no females remain.
既然它们能够而且确实可以成功杂交繁殖，它们就不能被归为不同的物种。
Since they can and do successfully inter-breed, they cannot be classed as different species.
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