光是关键。没有光，就没有图像。
"Light is the key. Without light, there is no image."
大自然是最好的老师；它已经做了实验，我们只需要解读它们。
The man with a toothache thinks everyone happy whose teeth are sound. The poverty-stricken man makes the same mistake about the rich.
不要等待完美的时机——抓住时机并让它变得完美。