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.

由在许多相距甚远科中， 单个种和单个属具有旋转能力，并因此成为双胞胎， 它们必须独获得它， 而不是从一个共同祖先那里继承它。

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.

认为，任何阅读这些回忆录人都会承认， 简单孪生和卷须之间在功能和结构上所有许多等级在每种情况下都对种有很大好处。