当population表示人口时可数吗,表示人的时候可数吗?

有时population可用作可数名词,其前可用不定冠词。例如:China has a population of about 1。3 billion。(=There is a population of about 1。3 billion in China。) 中国大约有十三亿人口。New York is a big city with a population of over 10 million。纽约是一个有一千多万人口的大城市。在表示多个地区的人口时,population要用复数形式populations。例如:Many parts of the world,which once had large populations and produced plenty of crops,have become deserts。世界上很多地区一度人口众多,种植大量的农作物;现在,这些地区已经变成了沙漠。