• 1. make sure make certain: 弄确实
• 2. ensure make sure make certain: 确保

• 1.This paper brings forward the method of dividing a city into different circle layers, make certain the property of each layer, to make sure the urban population and urbanization level.
  但由于城市行政界限的频繁变动和一些城市无限制地扩大市区行政面积 ，使城市人口和城市化水平的统计数字失真。
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