数学是一项协作的努力。没有人可以单独完成。
Joy sparks the urge to play, interest sparks the urge to explore, contentment sparks the urge to savor and integrate, and love sparks a recurring cycle of each of these urges within safe, close relationships.
"I don't believe in luck. I believe in hard work."
Every object has a shadow story waiting to be told.