刚刚想明白了道题目，写出来分享下 prep sc - 2 - 50中population的用法

1.   
                        With no natural predators and with expanses of green suburban neighborhoods where there is no hunting, the deer population in New Jersey, wildlife officials estimate, has grown to exceed 175,000

开始没明白为什么是the deer population而不是the dear,应该是鹿这种动物有predator而不是鹿的数目有，后来查了下字典发现population的几种用法:

1）people who live in an area, a city, a country,etc （地区，城市，国家的全体居民）

    Eg: the populations of western european countries

2）particular group or type of people or animals inhabiting an area, etc.(聚居于某地的）一群人或动物

    Eg: the working population 全体劳动者

          the immigrant population 全体移民

     （以前看到population就很自觉地联想到：人口数，后边一定是个数，汗。。）

3）total number of these 人口；区域内动物的总数

前边两类一直是被忽略掉的，原来长期以来一直误会population了。。。