If you want to keep something precious, you have to lock it up and throw away the key.
我们负责任地养殖的每一条鱼,都是从已经紧张的野生种群中减少的一条。
了解一个人是否值得信任的最好方法就是去信任他们。
Every mathematical problem is a puzzle waiting to be solved, and every solution is a step towards greater understanding.