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随便看	principle of significance principle of siheyuan principle of similarity principle of similitude principle of similtude principle of simplicity principle of simulation principle of sincerity Principle of Single-Chip computer principle of single liability principle of single product principle of smaller variance principle of sociololgy principle of software design principle of software engineering principle of software standardization principle of soil erosion classification principle of soil-fix-ation principle of solidarity principle of solidification principle of solubility.product principle of sound accounting principle of sound level meter principle of sovereign e-quality principle of sovereignty