森林的真正价值不能仅用板材英尺来衡量。
The true value of a forest cannot be measured in board feet alone.
We are at a unique stage in our history. Never before have we had such an awareness of what we are doing to the planet, and never before have we had the power to do something about it.
The magical number seven, plus or minus two: some limits on our capacity for processing information.
神奇的数字七，加减二：我们信息处理能力的一些限制。
Joy sparks the urge to play, interest sparks the urge to explore, contentment sparks the urge to savor and integrate, and love sparks a recurring cycle of each of these urges within safe, close relationships.