A proof of a proposition is a process the nature of which is such as to produce in us a belief in that proposition.

学习永远不会使心智枯竭。

快乐是当我们发挥潜能、实现本性时伴随而来的情感。

我们要加强国际合作，共同应对能源安全和气候变化的挑战。

Farmers are the true stewards of the land; their role is more critical now than ever.