解析：看到正义的事，却不能勇敢去做，这是懦夫的表现。

爱音乐的人，心里永远年轻。

All oppression creates a state of war.

You can't change the past, but you can ruin the present by worrying about the future.

Nothing is certain， and nothing is impossible.

真正的创新发生在学科的交叉点。