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population is an uncountable noun. When we talk about the population of a country or region, we usually use the singular form "the population". For example, "the population of China is over 1."4 billion。However, when we talk about the population of multiple countries or regions, the plural form "populations" can be used. For example, "the populations of China and india are the largest in the world." ”
It is worth noting that when we are talking about different kinds of groups, the plural form of "populations" can also be used. For example, "there are many different ethnic groups in China, each with its own unique culture and traditions."In this sentence, "ethnic groups" is the plural and "populations" is also the plural as they refer to different groups.
Alternatively, when we are comparing the populations of different countries or regions, we can also use the plural form of "populations". For example, "the populations of China and India are both very large, but China has a much larger population than India."In this sentence, "populations" are the plural as they refer to different countries or regions.
In conclusion, when we talk about the population of a country or region, we should use the singular form of "the population". However, when we talk about the population of multiple countries or regions, or different kinds of groups, we can use the plural form of "populations". The plural form of "populations" can also be used when comparing populations in different countries or regions.