不断学习，不断成长。
Keep learning, keep growing.
Profit and sustainability must go hand in hand; one cannot exist without the other.
可持续性不再是一个选择，而是一个商业必须。
数学的本质在于它的自由。
The jaws of power are always open to devour, and her arm is always stretched out, if possible, to destroy the freedom of thinking, speaking, and writing.
社会主义的功能是将苦难提升到一个更高的层次。