To gauge precipitation, they looked at tree ring widths in lower-elevation oaks, which grow faster in years with higher levels of rainfall.
而为了测定降水量，他们则对长在低海拔地区的栎树的年轮宽度进行研究，因为这些树在雨水比较充沛的年份长得更快。
Ultrasonic rain gauge rised up the measuring range and accuracy by adopted the ultrasonic technique to measure precipitation.
超声波雨量计采用超声波技术测量雨量，大大提高了其测量范围和精度。
Point interpolation algorithm is of important significance in analysis of rain-gauge station distribution, calculation of areal precipitation, and planning for rain-gauge net.
确定雨量站网密度是水文站网规划中的一个重要问题。
Point interpolation algorithm is of important significance in analysis of rain-gauge station distribution, calculation of areal precipitation, and planning for rain-gauge net.
确定雨量站网密度是水文站网规划中的一个重要问题。
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