Demography is the study of human populations and the ways they change. It looks at how many births, marriages, and deaths happen in a particular place at a particular time, and also at people moving from one place to another. From that, you can see whether a country is getting older, whether cities are growing, or whether there will be more children in ten years.

Demography is the study of human populations and the ways they change demography（人口學）是研究人類人口以及人口變化方式的學問。It looks at how many births, marriages, and deaths happen in a particular place at a particular time它研究的是在特定的地方、特定的時間裡，有多少出生、結婚跟死亡, and also at people moving from one place to another也研究人從一個地方搬到另一個地方的情形。From that, you can see whether a country is getting older從這些資料裡，你可以看出一個國家是不是正在老化, whether cities are growing城市是不是在成長, or whether there will be more children in ten years或十年後小孩會不會變多。

Though actually, demography is not only a pile of numbers. The numbers are a way to tell a story about how people live together, and what may happen next.

Though actually不過其實, demography is not only a pile of numbers demography 不只是一堆數字。The numbers are a way to tell a story about how people live together這些數字是用來說一個關於人們如何一起生活的故事, and what may happen next還有接下來可能會發生什麼事。

It is a formal, academic word, used in social science, government planning, and news about “an ageing population.” Students sometimes mix it with democracy because both start with demo-; they share an old Greek piece meaning “people,” but they are not the same subject.

It is a formal, academic word這是個正式、學術性的詞, used in social science, government planning, and news about "an ageing population."用在社會科學、政府規劃，還有關於「高齡化人口」的新聞裡。Students sometimes mix it with democracy學生有時候會把它跟 democracy（民主）搞混 because both start with demo-因為兩個字都是 demo- 開頭; they share an old Greek piece meaning "people,"它們共用一個古希臘字根，意思是「人民」 but they are not the same subject但這兩個不是同一個主題。