所有人类行为都有以下七个原因中的一个或多个:机会、自然、强迫、习惯、理性、激情和欲望。
The only limit to our realization of tomorrow will be our doubts of today.
The future of forestry lies in technology, but it must serve nature, not exploit it.
Sustainable development requires balancing economic growth with ecological protection.
A coward is incapable of exhibiting love; it is the prerogative of the brave.
我了解到失败不是成功的对立面,而是成功的一部分。