Zài gōnggòng chǎngsuǒ dàshēng xuānhuá wéibèi le shèhuì gōngdé.
Making loud noise in public places violates social morality.
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One leg of the standard triad 公德 / 职业道德 / 家庭美德 (civic / professional / family ethics) used in PRC 'spiritual civilization' (精神文明) education. Contrast 公德 (toward strangers, in public) with 私德 (private moral character).