He loses, in an extent proportioned to the weakness or force of his original nature, the capability of self-support.

他在某种程度上失去了自立的能力，这与他的本性的弱点或力量成正比。

Agronomists and the like have taken to breeding all sorts of vegetables and fruits ----changing their original nature .

农学家之类的人物搞起了各种蔬菜和水果的培育一一改变它们原有的特性。