Population is increasing in that country in a geometric progression.
那
国家的人口正
级数增长。
Population is increasing in that country in a geometric progression.
那国家的人口正级数增长。
The E optotype on the chart had 3 limbs of equal length.A regular geometric progression of optotype sizes and distribution was employed to arrange 14 lines with 4 optotypes on each line.
采用三划等长的E形视标，视标大
及排列采用均匀的增率，每行视标数
4，
14行，每两行视标变化进率拶而。
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