2. If a nation wants to stand on the highest peak of science, it can't do without theoretical thinking for a moment.
3. Chemistry is a science that studies the qualitative change of objects due to the change of quantity composition.
As long as natural science uses thinking, its development form is hypothesis.
5. Each science analyzes a single form of motion or a series of interrelated and transformed forms of motion.
6. Physics is called molecular mechanics, chemistry is called atomic physics, and biology is called protein chemistry.
7. Labor creates man himself.
8. We should not be too intoxicated with the victory of mankind over nature. Every time such a victory, nature will retaliate against us.
9. Principle is not the starting point of research, but its final result.
10. The more stressful life is, the more vitality people can show.
1 1. Only a marriage based on love is moral.
12. Courage and belief in winning often lead to victory in the battle.
13. There is no catastrophe that cannot be compensated by historical progress.
14. Only when the possibility of victory is very high can a decisive battle be held.
15. No religious doctrine can support a distant society.