"The profession of book writing makes horse racing seem like a solid, stable business."

Success is not final, failure is not fatal: It is the courage to continue that counts.

The key to success is to focus our conscious mind on things we desire not things we fear.

The future of forestry lies in balancing economic needs with ecological responsibility.

程序测试可以用来显示错误的存在，但绝不能显示它们的不存在！