In Ecuador, Texaco left a legacy of disease and environmental damage on a massive scale [for a thorough discussion of the issue, see my online review of the recent documentary, Crude].
The hybrid scale of mixed crude was calculated by using the mathematical model and the parameters of biomarkers of two kinds of crude oil.
利用混合原油的生物标志物参数和数学关系式，计算了西部弧形构造带两种原油的混合比例。
3
A hierarchical scheduling approach is presented by a simplified scheduling model of refinery crude system with both reduced problem scale and length of solving time.