我是Perl的新手.我需要在Perl中定义一个如下所示的数据结构:
city 1 -> street 1 - [ name , no of house , senior people ]
street 2 - [ name , no of house , senior people ]
city 2 -> street 1 - [ name , no of house , senior people ]
street 2 - [ name , no of house , senior people ]
我该如何实现这一目标？