北边是奥运村，绿化很好，空气清新。
The north is the Olympic village, green good, the air fresh.
以典型三阶抽样和一阶抽样方法，建立调查样本，对中山市乡镇和自然村四旁绿化进行抽样调查。
Survey samples are set up by using typical methods of 3-rank and 1-rank sampling to survey the turning the "four sides" green of townships and villages in Zhongshan City.
以典型三阶抽样和一阶抽样方法，建立调查样本，对中山市乡镇和自然村四旁绿化进行抽样调查。
Survey samples are set up by using typical methods of 3-rank and 1-rank sampling to survey the turning the "four sides" green of townships and villages in Zhongshan City.
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