三口之家地道的翻译是nuclear family
例：
I was born in a nuclear family．我出生在一个三口之家
那么四世同堂类的大家庭就要译为 extended family 了
在口语表达中 ，三口之家可以译为
a family of three persons 或a family of three
例句：Special offer on Sunday: a family of three is served a free Bottle of drink with their western Buffet in this restaurant.
周日优惠，三口之家来本店品尝西式自助餐均免费招待饮料一瓶 ．
the family with three people
补充：
晕菜靓靓 的回答是指“核心家庭”，根据字典里的解释，就是“三口之家”，建议把他选为最佳答案。
错!最标准的答案是: The nuclear family
当然是nuclear family 拉
Forget it
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