We begin with the hypothesis that any subject can be taught effectively in some intellectually honest form to any child at any stage of development.
He who plants a tree plants a hope.
有利的时机和气候不如有利的地势，有利的地势不如人的齐心协力。
采矿效率不仅仅是成本问题，更是减少环境影响的问题。
Be still. Apart from this the mind has no task to do or thought to think.
The key to success is to focus on goals, not obstacles.
"History is not just a series of events, but a complex web of human experiences and emotions."