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city area
The population in this city area is rapidly increasing.
quick, rapid
I was surprised at his quick progress.
quickness, rapidity
I am surprised at the quickness of this project's progress.
to increase (in numbers, quantity, or volume)
The population is increasing rapidly.
population
The population of Japan is decreasing.
Kyūjitai form of 人口学: demography
Demography is a branch of social science that studies the structure, distribution, and changes in human population.
population density
Tokyo is the city with the highest population density in Japan.
census
The next census will be conducted next year.
demography
Demography is a part of social science that studies the structure, evolution, and problems of human population.
a population pyramid
Looking at the population pyramid, you can see that this country is aging.
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