森林的真正价值不能仅用板材英尺来衡量。
每次实验都是与自然的对话,而自然总有话要说。
The most profound theories often arise from the simplest observations.
All our dreams can come true if we have the courage to pursue them.
发现的喜悦无疑是人类心灵所能感受到的最活跃的。