Every child should have mud pies, grasshoppers, water bugs, tadpoles, frogs, mud turtles, elderberries, wild strawberries, acorns, chestnuts, trees to climb, brooks to wade in, water lilies, woodchucks, bats, bees, butterflies, various animals to pet, hayfields, pine-cones, rocks to roll, sand, snakes, huckleberries and hornets; and any child who has been deprived of these has been deprived of the best part of education.

I always try to improve myself.

人渴时，一滴水就像甘露一样甜美；人醉后，再添酒还不如不添的好。

If we want clean air and water, we must start by protecting our forests.

意识服务于有机体有效与世界互动的需求。