As in many widely separated families of plants, single species and single genera possess the power of revolving, and have thus become twiners, they must have independently acquired it, and cannot have inherited it from a common progenitor.

由于在许多相距甚远的植科中， 种和属具有旋转的能力，并因此成双胞胎， 它们必须独获得它， 而不是从一共同的祖先那里继承它。

He who will read my memoir on these plants will, I think, admit that all the many gradations in function and structure between simple twiners and tendril-bearers are in each case beneficial in a high degree to the species.

我认，阅读我关于这些植的回忆录的人都会承认， 简孪生植和卷须植之间在功能和结构上的所有许多等级在每种情况下都对种有很大的好处。