One of the most underappreciated forces affecting life in the U.S. is the sex ratio. 男女比例對美國人的生活深具影響，但幾乎不受重視。
Second, a disproportional rate of male and female students in one class is conducive to class discipline and learning effect. 其次，男女比例不一致有利于班級紀律和學(xué)習成效。
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