Sustainability isn't a destination—it's a daily practice.

There are two possible outcomes: if the result confirms the hypothesis, then you've made a measurement. If the result is contrary to the hypothesis, then you've made a discovery.

学习数学的最好方法就是做数学。

【释义】一个人的心志直接影响一个人的气节，而气节是统帅身体的重要支撑。