The most important thing is to have a good heart and a good attitude.
林业的未来在于技术，但它必须服务于自然，而不是剥削自然。
There is no such thing as a moral or an immoral book. Books are well written, or badly written. That is all.
可归约性的概念对于理解不同计算问题之间的关系至关重要。