创造东西真的很难。你必须非常在乎它，才能克服所有的失望和挫折。
Making something is really hard. You have to care about it so much that you will push through all the disappointments and frustrations.
光的理论实际上是弹性介质振动的理论。
希望是脆弱的，但它也是我们拥有的最强大的力量。