单词spirit leveling
un.: 〔测〕水准测量网络: 直接水平；水准测高；气泡水准测定
〔测〕水准测量
In general the accuracy of geoidal heights, as given by spirit leveling, much exceeds that of any other system.
一般说来，水准测量测出的大地水准面高程的精度，远远超过任何其它方法的精度。