求翻译：过去40年美国家庭构成变化趋势的延续。晚婚晚育、离婚率上升以及单亲家庭增加等，是促成上述趋势的主要因素。是什么意思？

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In the past 40 year American family constitution change tendency extension.The delayed marriage and postponement of having children, the divorce rate rise as well as the single-parent family increase and so on, are facilitate the above tendency the primary factor.

The past 40 years United States families constitute a continuation of the trend. Late marriage and late childbirth increased, rising divorce rates and single parent families, and so on, are main factors contributing to these trends.

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