"The only thing that could spoil a day was people. People were always the limiters of happiness except for the very few that were as good as spring itself."

If you can't explain it simply, you don't understand it well enough.

The only way to learn mathematics is to do mathematics.

在能力圈内做事。

能源转型既带来挑战也带来机遇 - 适应者将蓬勃发展。