• 1. decrease in population: 人口减少
• 2. sharp decrease in population: 人口锐减

• 1.There has been a progressive decrease in population every year in this city.
  这个城市的人口在逐年递减。
  dict.yoduao.com
• 2.There has been a steady decrease in population in this city.
  这个城市的人口在持续下降。
  dict.yoduao.com
• 3.There has been a steady decrease in population in this city.
  这个城市的人口在不断减少。
  dict.yoduao.com

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