求翻译：美国人口统计局公布的资料显示，在美国一度非常普遍的核心家庭数目过去10年间继续减少，而由非婚同居者或单身者构成的家庭数却大为增加。是什么意思？

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According to the United States Census Bureau has published in the United States, a number of families are very common in the past 10 years core continued to decrease, while the non-marital cohabitation constitutes a number of families or single persons increased significantly.

US Bureau of Vital Statistics announces the material demonstrated, passed in the US once extremely universal nuclear family number during for 10 years to continue to reduce, but by must married the housemate or the unmarried constitution family number actually greatly was the increase.

United States Census Bureau released data show that in the United States was very generally continued to decline over the past 10 years the number of nuclear families, made up of unmarried cohabitation or single people has greatly increased the number of families.

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