农业成功的真正标准不仅仅是产量，还包括土壤的健康和它所支持的社区。
The act of writing is an act of courage.
The discovery of DNA structure was like unraveling a very complex puzzle.
War is the continuation of politics by other means.
The only freedom which deserves the name is that of pursuing our own good in our way， so long as we do not attempt to deprive others of theirs or impede their efforts to obtain it.