A masterpiece is not perfect, but perfectly honest.
过度捕捞是一个全球性挑战,需要全球解决方案和共同责任。
To do mathematics is to explore a universe of ideas, where the only limit is your imagination.
语言是一种皮肤:我用我的语言摩擦他人。就好像我有词语代替手指,或者手指在词语的尖端。