欧洲的科学家找来了一些志愿者，叫他们衡量一些统计值，比如瑞士的人口密度等等。
European scientists asked volunteers to estimate statistics like the population density of Switzerland.
比如，人口密度，街道状况，企事业数量，水的深度。
Such as population density, street layouts, number of enterprises, water depth.
比如，人口密度，街道状况，企事业数量，水的深度。
Such as population density, street layouts, number of enterprises, water depth.
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