Physical training is good, but it should be voluntary; forced learning does not stay in the mind.

The concept of freedom is inseparable from the concept of truth.

Sustainability isn't a trend; it's our responsibility to future generations.

在科学问题上，一千人的权威抵不上一个人的谦逊推理。

Innovation is not just about creating something new; it's about making a difference in people's lives.

因此，教学艺术无非是时间、科目和方法的巧妙安排。