The joy of discovery in mathematics is like solving a puzzle that the universe has left for us.
3、如果相爱，那是无限的。
词语曾是我的祖国，而我被剥夺了它。
The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.