There were lots of kids in my neighborhood when I was growing up.

neighborhood 是由 neighbor（邻居）加上后缀 -hood 构成的名词。neighbor 指"邻居"，后缀 -hood 表示"状态、性质或群体"，所以 neighborhood 指的是"邻近地区、社区"，即居住在同一区域的人们及其环境。