primary air quantity 一次风量
Virtually all experts agree that the fee-for-service system—doctors are rewarded for the quantity of care rather than its quality or effectiveness—is a primary reason that the cost of care is so high.
事实上，所有的专家都同意按服务收费的系统——医生的报酬取决于医疗服务的数量，而不是质量或效率——是医疗成本如此高的一个主要原因。
The size of the data quantity is the primary factor in the division.
数据量的大小是决定分割的主要因素。
Reproduction and mortality are two primary factors to affect population quantity dynamic.
种群的数量季节消长主要是繁殖和死亡两因素相互作用的结果。
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