The ratio of primary care doctors to population is higher in Massachusetts than in other states.

在马萨诸塞州，初级保健医生与总人口比例高于其他各州。

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Engine pressure ratio (EPR), the ratio of inlet pressure over exhaust-let pressure measurements. The ratio is used as the primary parameter to set thrust on some engines.

发动机压力比(epr)，进气压力与排气压力值的比，某些发动机以此作为设定推力的主要依据。

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The test shows that size distribution of feeding coal, volatile content and its release as well as the total air rate and primary air ratio will influence the post combustion in CFB boiler.

测试结果表明，影响后燃现象的主要因素是给煤的粒度分布、煤挥发分含量及挥发分析出规律，同时与炉膛内总风量、一二次风量的配比有关。

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In both maintained nursery schools and nursery classes attached to primary schools, the ratio for three- to five-year-old children should be 2:26, or 1:24 where the headteacher also teaches.

BBC: Nursery

Net Enrollment Ratio in primary education had increased from 58% in 1999 to 76% by 2010 and the Gender parity index from 0.85 to 0.93 over the same period of time.

UNESCO: EDUCATION

Mr da Silva, likewise, could keep reiterating a recent pledge to maintain a sufficient primary surplus to stabilise the government-debt ratio.

ECONOMIST: Brazil