Americans view themselves as being in a state of competition with other individuals and families for values that are largely material in character. 美国人看待他们自己当与其他的个人和家庭处在一个竞争状态中时，价值观本质上是大量地物质导向。
Basically light involves a vibrating electric field, and when that field has to push around the electrons in a material its life gets more complicated. 光从本质上看就是一个振荡的电场，当这个电场碰到介质中的电子，情况变得更加复杂。
美
