Exposurelatitude: its lower limit is at the intersection point of the two curves, with an exposure time of 15 units for the example below.
地理纬度：其下限暴露在交叉点的两曲线，与一个曝光时间15个单位为下面的例子。
2
The Maine studies focused on the way that UVR exposure varies according to latitude, and the effects this seemed to have on the characteristics and health of populations.