因为只要它们可以进行品种间杂交，那些动物群体间的所有障阻都会打破。
Because as soon as you have interbreeding, all those barriers [between those groups of animals] break down.
“但是，我们没有发现这种麻雀，因此我们认为，这两个物种已经形成了某种彼此之间的繁殖障阻，”萨特尔教授说。
"But we didn't find this, so we think [the two species] have formed some kind of reproductive barrier to each other," Prof Saetre said.
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