人类的思想和行为是自然的一部分,因此可以通过自然科学的方法来研究。
You don't get over a loss like that; you learn to live with it.
我们谷物生产成功的真正标准不仅在于产量,还在于我们如何平衡生产力与环境管理。
I have been a selfish being all my life, in practice, though not in principle.