2. Nature is a kind mother and a cruel butcher. —— Hugo

3. People often treat their surroundings as a free commodity and spoil them at will without knowing how to cherish them. —— Gan Haman

4. The earth gives all people the essence of material. What it gets in return from people is the rubbish of these materials. —— Whitman

5. We can't force nature, but also obey it .——— Escuman

6. As a result of our violation of nature, we destroy the beauty of natural landscape, natural dynamic beauty and natural beauty. —— norman cousins

7. If we want to be safe in life, we should have five things: Second, we must clarify drinking water; Third, it is necessary to circulate ditches; Fourth, we must sweep the house; Fifth, there should be plenty of sunshine.-Nightingale