下三角形矩阵
low switching transient
lost calls cleared
loop compensation amplifier
lower triangular matrix
下中三叠统
Lower-middle Trias series
Lower-middle Triassic
协方差矩阵的上-下三角分解法
lower-upper(LU) triangular decomposition of the variance matrix
城市下压煤
coal block under urban area
村庄下压煤
coal under villages
Coal Mining under Village
建筑物下压煤
Coal Mining under buildings
下第三系沙河街组
Paleogene Shahejie formation
使用下三流手段
using underhanded tactics
上/下第三系界线
boundary between Neogene and Palaeogene Formations