lower triangular matrix是什么意思

用法例句

Storm deposits of the Daye Formation of Lower Triassic in Huangshi area of eastern Hubei Province;

鄂东黄石地区下三叠统大冶组风暴沉积

Sedimentary facies of evaporative carbonate platform of the Feixianguan Formation of Lower Triassic in northeastern Sichuan Basin;

四川盆地东北部下三叠统飞仙关组碳酸盐蒸发台地沉积相

Lower Triassic Conodont Zonations of Chaohu Area, Anhui Province and Their Global Correlation;

安徽巢湖地区下三叠统牙形石生物地层分带及其全球对比

“Down Three Zones” in the Prediction of the water inrush from Coalbed Floor Aquifer theory,Development and Application;

预防矿井底板突水的“下三带”理论及其发展与应用

The “down three zone”theory provides theoretical foundation for security evaluation.

下三带理论为分析、评价底板抗突水能力提供了理论指导。