The past is not for living in; it is a well of conclusions from which we draw in order to act.
Freedom is not something that anybody can be given. Freedom is something people take, and people are as free as they want to be.
交易成功的关键是有一个计划并坚持执行。
采矿业必须在不影响效率的情况下发展以满足可持续发展的需求。