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Chemistry is the science of matter, but I prefer to see it as the science of change.
译文:对于天下的士人,最可贵的是能够排除忧患,消除纷争,解决困难,而不去索要任何回报。
The way in which men produce their means of subsistence depends first of all on the nature of the actual means they find in existence and have to reproduce.