All that we want to show is, that where many species of a genus have been formed, on an average many are still forming; and this certainly holds good.

我们想要表明的是， 在一个属的许多物种已经形成的地方，平均而言，许多物种仍在形成； 这当然很好。

We've seen this process occur in other radiations such as Darwin's finches, where from a single common ancestor they formed many different species that are confined to different islands in the Galapagos.

我们已经看到这个过程发生在其他辐射中，例如达尔文的雀类，它们从一个共同的祖先形成了许多不同的物种，这些物种被限制在加拉帕戈斯群岛的不同岛屿上。