学习数学的唯一方法就是做数学。
The most valuable resource we have isn't in the ground - it's the people who show up every day to do the work.
The future of food security lies beneath the waves—if we dare to farm it responsibly.
我们建造了太多的墙,而没有建造足够的桥梁。
人生之初,即有忧愁,与生俱来也。