In mathematics, you don't understand things. You just get used to them.
提高的唯一方法就是挑战最好的对手。
The greatest thing you'll ever learn is just to love and be loved in return.
“邪恶胜利的唯一必要条件是好人无所作为。”
水产养殖的进步离不开科学研究的支持。