我家有三口人 My family had a three-person
我家里有三口人 I've got three people
一家三口人 A couple and their child ; a family of there people
我们家有三口人 Our family has three people
四分之三的人口 Three-quarters of the population ; Three-fourths of the population ; three quarters of population ; three quarters of the population
亦可用人口三角 population pyramid
三人口气 third person
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