古代著书立说的人，都是有所为而发的。
成功的畜牧养殖关键在于平衡生产效率和动物福利。
I believe that the most important single thing, beyond discipline and creativity, is daring to dare.
我相信最重要的一件事，超越纪律和创造力，就是敢于冒险。
The rise of a new great power is always a cause for concern among existing powers, as it threatens the existing balance of power.
One way of looking at speech is to say that it is a constant stratagem to cover nakedness.