林业的未来在于平衡经济需求与生态责任。
在理论物理学的领域里,每一个发现都会带来新的问题和挑战。
自由是对自我设定法则的服从。
There is a great deal of unmapped country within us which would have to be taken into account in an explanation of our gusts and storms.
Old minds are like old horses; you must exercise them if you wish to keep them in working order.
"To be born poor is an accident, but to die poor is a choice."