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"The world is indeed full of peril, and in it there are many dark places; but still there is much that is fair, and though in all lands love is now mingled with grief, it grows perhaps the greater."

可持續(xù)農(nóng)業(yè)不是成本，而是我們能做的最明智投資。

In the world of physics, we often find that the simplest questions are the hardest to answer.