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The concept of legal validity is crucial for understanding the nature of law.

用心管理的森林才能長久存在。

林業的未來在于平衡經濟增長與生態保護。

People are just as wonderful as sunsets if you let them be. When I look at a sunset, I don't find myself saying, 'Soften the orange a bit on the right hand corner.' I don't try to control a sunset. I watch with awe as it unfolds.

象征權力是一種無形的權力，只有在那些不想知道自己受其支配甚至自己也在行使它的人的共謀下才能行使。

A person may cause evil to others not only by his actions but by his inaction， and in either case， he is justly accountable to them for the injury.