Since they can and do successfully inter-breed, they cannot be classed as different species.

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。

《柯林斯英汉双解大词典》

Since they can and do successfully inter-breed, they cannot be classed as different species.

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。

《柯林斯英汉双解大词典》