I'm the reason your stars won't twinkle.

You see, in life, lots of people know what to do, but few people actually do what they know. Knowing is not enough! You must take action.

It is not the benevolence of the employer that determines the wages of labor， but the competition among employers.

The Langlands program is a reflection of the unity of mathematical thought.

石墨烯是一种灰姑娘材料：它一直存在，但没有人注意到它。