健康的森林生态系统同时支持自然和商业。
A healthy forest ecosystem supports both nature and commerce.
The principle goal of education in the schools should be creating men and women who are capable of doing new things, not simply repeating what other generations have done.
没有一个明智的飞行员会忘记使用他的清单，无论他的才能和经验有多么出色。