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Census
人口调查
Do you know what a census is?
你知道什么是人口调查吗？
It is an official survey of a country to learn about people living in the country.
它是一个国家用来了解人民生活的官方调查。
In the United States, there is a government agency that takes the census.
在美国，有一个政府机构负责人口调查。
It sends survey letters to every household in the United States.
它向美国的每个家庭发送调查信件。
The survey asks the number of people in a household, their age, gender, jobs and so on.
调查询问家庭人数，他们的年龄、性别和工作等等。
In ancient Rome, a census was taken to record the number of adult men for military service.
在古罗马，人口调查用于记录参军的成年男子人数。
But now, countries take censuses to learn about their citizens and plan various policies.
但现在，国家实施人口调查用来了解公民和计划各种政策。
