综合类：问题解答twice as many households
twice as many households in the united states are headed by divorced， separated， or never-married individuals as are comprised of nuclear families的意思是美国许多家庭离婚、单身、未婚是核心家庭的两倍。对吗？
解答：
这句话的意思是：“由核心家庭构成的单亲家庭是美国由于离婚，分居，或者未婚导致的单亲家庭的2倍”。
有时在做题的时候，我们可能无法将句子翻译的非常精确，但只要我们能够领会大意进行答题就可以了。
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相关内容：
the nuclear family was not always the north american standard. in a more agrarian time农业社会时期， the small nuclear family was usually part of a larger extended 广大的family. this might have included grandparents， mother and father， brothers and sisters， uncles， aunts， and cousins表兄妹. in north america today， there is a dramatic rise in the number of single-parent households. twice as many households in the united states are headed by divorced， separated， or never-married individuals as are comprised of nuclear families. the structure of the family， not just in north america， but throughout the world， continues to change as it adapts to changing conditions.