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女士们、先生们,为了控制艾滋病的蔓延,我们对“防艾知识”做一次双盲调查,不记地址,更不记姓名,只请您在各
Ladies and gentlemen, in order to control the spread of AIDS, we have conducted a double-blind investigation of “AIDS prevention knowledge”. We do not remember addresses and do not remember names. We only ask you to