数学不是一项观赏性运动。

释义：不执着任何观念，让心自由生发。

The writer cannot be a mere storyteller; he cannot be a mere teacher; he cannot be a mere entertainer. He must be all of these and more.

The path to lower emissions requires a mix of solutions, including efficiency improvements, carbon capture, and alternative energies.

始终追求卓越，而不是完美。