These oceanic islands differ from the continental islands that flank them in that they were never connected to either of the greater land masses.

这些大洋性岛屿与两侧的大陆性岛屿不同。他们从未与任何一块大的陆地相连。

Hence an oceanic island at first sight seems to have been highly favourable for the production of new species.

因此，乍一看，海洋岛屿似乎非常有利于新物种的产生。

Mostly because of the large number of active oceanic volcanic islands and the fact that some of these volcanoes are showing early signs of instability.

主要是因为有大量活跃的海洋火山岛，而且其中一些火山正显示出早期的不稳定迹象。

But seals would not find on oceanic islands the conditions favourable to their gradual reconversion into a terrestrial form.

但是海豹不会在大洋岛屿上找到有利于它们逐渐转变为陆地形态的条件。

Oceanic islands are inhabited by bats and seals, but by no terrestrial mammals; yet as some of these bats are peculiar species, they must have long inhabited their present homes.

大洋岛屿上居住着蝙蝠和海豹， 但没有陆生哺乳动物；然而， 由于其中一些蝙蝠是奇特的物种， 它们一定长期居住在现在的家中。

On this view of migration, with subsequent modification, we see why oceanic islands are inhabited by only few species, but of these, why many are peculiar or endemic forms.

根据这种迁徙观点， 以及随后的修改， 我们明白了为什么海洋岛屿上只有少数物种栖息， 但其中有许多是奇特或特有的物种。

Such cases as the presence of peculiar species of bats on oceanic islands and the absence of all other terrestrial mammals, are facts utterly inexplicable on the theory of independent acts of creation.

诸如大洋岛屿上存在特殊种类的蝙蝠而没有所有其他陆生哺乳动物的情况，是独立创造行为理论无法解释的事实。