数学的本质在于它的自由。
The most dangerous chemical in any plant isn't the one in the vats - it's complacency.
目的赋予心理活动意义。
当今世界面临的最重要挑战是在发展中国家建立强大、有效且负责任的国家。
"The cost of oblivious daydreaming was always this moment of return, the realignment with what had been before and now seemed a little worse."