This is what scientists call a biogeographic boundary, the meeting point of two regions of biodiversity that are highly distinct.

这就是科所说的边界，也就是两个高度不同的多样性区域的交汇点。

The biogeographic line that he drew, which others would tweak in later years, didn't just reflect the proximity of the islands.

他所画的线，在未来的日子里，其他人会对它进行调整，并不是只反映了这些岛屿的接近性。