1. All tools and machines on the earth are just the development of the perception of human limbs. ——Emerson

2. If aliens can come to the earth, it means that their level of civilization far exceeds that of us humans. ——Zhou Haizhong

3. Everyone learns and uses their knowledge to make the country prosperous and strong, not subject to foreign aggression, and able to stand on its own on the earth.

——Zhan Tianyou