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Agriculture is the foundation of manufactures, since the productions of nature are the materials of art.
采矿业必须进化否则就会过时,没有中间地带。
The past is always tense, the future perfect.
我相信对你所做的事情有热情是很重要的。如果你没有热情,当事情变得艰难时,你就不会有继续前进的能量。
The desire for verification is understandable but cannot always be satisfied.