时间并不存在。对于河水来说，只有当下。没有过去，没有未来。
The future of forestry lies in balancing economic growth with ecological responsibility.
Expertise in any domain involves the automation of basic skills, freeing attention for higher-level aspects of performance.
【解释】脑力劳动者统治人，体力劳动者被人统治；被统治者养活别人，统治者靠别人养活，这是通行天下的原则。