所有卓越的事物都与它们的稀有性一样困难。
All things excellent are as difficult as they are rare.
每一个挑战都是学习和成长的机会。
The market is a complex system, and we try to simplify it with models.
The less secure a man is, the more likely he is to have extreme prejudice.
Innovation in forestry practices is key to balancing economic growth and environmental protection.