水的源头如果浑浊，那么水流就不可能清澈；言行不讲信用的，名声必然受到损害。

Your smarts will come in handy because you will travel in a land of marvels. We humans -- plodding as we are -- will astonish ourselves. We'll invent ways to generate clean energy and a lot of it. Atom by atom， we'll assemble tiny machines that will enter cell walls and make repairs. This month comes the extraordinary but also inevitable news that we've synthesized life. In the coming years， we'll not only synthesize it， but we'll engineer it to specifications. I believe you'll even see us understand the human brain. Jules Verne， Mark Twain， Galileo， Newton -- all the curious from the ages would have wanted to be alive most of all right now. As a civilization， we will have so many gifts， just as you as individuals have so many individual gifts as you sit before me.

印染时织品用青色染料就变成青色，用黄色染料就变成黄色。随着染料的变化，织品的色彩也变化，放入多种染料则呈现出五颜六色的变化。所以对于印染不可不慎重！说明每个人的思想和意识形态是随着环境的变化而变化的，每个人都会受到环境的影响。在一个人际关系复杂的环境中，人的思想也会变得复杂；而在人际关系相对简单的环境下，人的思想也会相对纯朴，什么样的环境造就什么样的人。