随温度降低SOD活性也呈先增后减趋势；
The stress activity of SOD increased at first and then decreased.
发现男性农民工平均工资远高于女性，工资随年龄的增加先增后减。
Found that men's average wage of rural migrant workers is much higher than female wages increase with age after the first cut increased.
在中间状态，车辆折算系数最大，且分别随流量和混入率的增加先增后减。
When traffic flow is in between, Passenger Car Equivalent will increase with the increase of mixed traffic flow and mixed rate respectively at first and will decrease at last.
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