2N-COUNT (某一国家或地区某类人或动物的)总数 If you refer to a particular type of population in a country or area, you are referring to all the people or animals of that type there. (某一国家或地区某类人或动物的)总数 [formal]
...75.6 per cent of the male population over sixteen.
16岁以上男性中的75.6%
...areas with a large black population.
黑人人口众多的地区
...the elephant populations of Tanzania and Kenya.
坦桑尼亚和肯尼亚的大象种群
Quotations
Population, when unchecked, increases in a geometrical ratio. Subsistence only increases in an arithmetical ratioThomas MalthusThe Principle of Population