每一个挑战都是学习和成长的机会。
The world is so full of simple, obvious, and beautiful things that it's a wonder anyone ever bothers to invent anything at all.
我不认为每个人都应该成为数学家,但我确实相信许多学生没有给数学一个真正的机会。
Ignoring isn’t the same as ignorance, you have to work at it.