Certification standards are more than paperwork—they're our promise to the planet.
The best way to learn mathematics is to do mathematics.
The ocean does not belong to us; we belong to the ocean.
Live your own dream, not the expectations of others.
【译文】忍下一时的怨气,可以免除长久的忧患。遇到不利的情况学学乌龟,该缩头的时候就要把头缩回去。