Super - heavy oil in shallow reservoirs has high viscosity and poor mobility, and is difficult to recover.

浅层超稠油油藏地层原油粘度大，流动性差，开采难度大。

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As to the high viscosity and poor mobility of heavy oil, conventional methods are difficult to exploit cost-effectively.

但是由于稠油粘度高、流动性差的特性，常规方法很难经济有效地开采。

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poor mobility, cognition, and vision, particularly among those living in an institution, such as a nursing home or chronic care facility;

流动性、认知能力和视力较差，尤其是在公共服务性机构，如养老院或长期护理设施中生活的人；

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So how did we end up in a position where social mobility is poor and worsening?

BBC: Social mobility: Less privileged face fight for top jobs

Yet, according to Mr Varma, the Indian middle class shows little inclination to fight the corruption, bad governance and incompetence that hold back the poor and block upward mobility through education.

ECONOMIST: Beyond Wisteria Lane

While we may disagree on economic solutions, Tavis Smiley acknowledges this much and I'm encouraged that with voices like his we can start building consensus around issues crucial to the upward mobility of many poor and disadvantaged Americans.

CNN: Reduce poverty by promoting schools, families