It has done me good, because of the color of the wheat fields. Go and look again at the roses. You will understand now that yours is unique in all the world。

The past is a shadow that follows us into the future.

败坏德行的行为有许多，而酗酒必定败德；伤害生命的行为也有许多，而好色必定伤生。

在林业中，长远眼光不仅可取，而且必不可少。

Fear can hold you prisoner. Hope can set you free.

We are all of us made by what we have lost as much as by what we have gained.

化学的基本问题是化学键的性质。