Population is increasing in that country in a geometric progression.
那个国家的人口正以几何级数
。
Population is increasing in that country in a geometric progression.
那个国家的人口正以几何级数。
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.
用三划等的E形
标，标大
及排列用均匀的几何率，
标数为4个，共14，两标变化进率为拶而。
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