The difference of PC and NC in different economic level group had statistical significance(P<0.001).
不同经济水平组NC、PC的差异都有统计学意义（P<0.001）。
Different groups'current economic level will give different endogenous effect to different pollutant.
②不同组别的当前经济水平会给不同污染物带来不同的内生性影响。
The ancient Chinese "spring country walk", "outing" and modern rural tour are different concerning the overall scale, economic consumption level, but they originally interconnected.
中国古代踏青、郊游与现代城郊旅游就总体规模、经济消费水平与项目类型来说是不同的，然而它们是一脉相承的。
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