Watercolour still seems somehow to be the poor relation of oil painting.
水彩画似乎仍比油画略逊一筹。
Poor quality oil reserves(PQOR)is still an important resource.
低品位石油储量也是我国重要的石油资源。
The critical problem in heavy oil production is high viscosity and poor flowability.
稠油的流动性差，粘度大，开采的关键问题是降粘、改善其流动性。
The efficiency of oil recovery with water flooding process is poor in low-permeability oil reservoirs.
低渗透油藏注水开发效果差、采收率低，而采用气驱技术是动用此类难采储量的有效方法之一。
Reducing oil use in the transport sector is essential to preventing starvation in poor countries.
减少运输部门的石油消耗对防止穷国出现饥饿现象极为重要。
Reducing oil use in the transport sector is essential to preventing starvation in poor countries.
减少运输部门的石油消耗对防止穷国出现饥饿现象极为重要。
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