People believe that pigs are dirty animals because they rootle about in the mud for their food 人们认为猪是肮脏的动物，因为它们用鼻子在泥地里翻拱觅食。
2.
The existence of south great wall need no more testification . the " border wall of miao area " had nothing different in time . framework and function from the north great wall except the area it passed with humid climate and dense population , so the peculiarly cultural background of the great wall as functional borderline between different ethnic cultures in history was embodied clearly in a little county . it is advantageous for us to rootle cultural content of the great wall and produce popular brand of tourism on the great wall culture 中国南方长城的存在已是不争的事实，苗疆边墙不论从修筑的时间、结构和功能上都与北方长城没有什么两样，不同的是它经过我国温暖湿润的地区，那里民族众多，人口密度较大，从而使长城作为历史上中国特定地区不同民族文化之间的功能界线，这一特有的文化背景，在更小的区域内得到了清晰地体现。
