Each of us is the author of our own story, though sometimes we cannot control the ending.

试错的成本是最低的。

尿素合成是一个幸运的发现，但它开辟了一个新的研究领域。

Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it.

You can't change the past, but you can create the future.