Real suffering does not come from outside, but from how we understand it.

Civilization as it is known today could not have evolved, nor can it survive, without an adequate food supply.

现在很清楚，杂种形成的种子具有两个分化性状中的一个或另一个，其中一半再次发育成杂种形式，而另一半产生保持恒定并以相等数量接收显性或隐性性状的植物。