用"墮落"形容"同居"合理嗎？

　

        The one-year national survey was conducted by the Beijing Normal University's psychology department, which interviewed more than 2 million people around the country.

　　北京師范大學心理學系開展的一項為期一年的全國調查共對全國200多萬人進行了訪問。

　　A report on love and marriage in Chinese society was compiled based on the survey, whose results were released on Tuesday.

　　該調查結果于本周二公布，有關部門還根據該調查編撰了一份有關中國社會愛情及婚姻觀的報告。