该模型将变量液压泵等效为液阻、压力突变、恒流源构成的一般液压元件。
By the new model, a variable displacement hydraulic pump is simulated by the ordinary hydraulic component with hydraulic resistance, abrupt pressure change and invariable flow.
约翰逊：还有，最先进的物种，比如人类和类人猿，是数百万年前物竞天择的压力和基因突变两者结合作用下的产物。
Another thing: the most developed species, like humans and apes, are products of a very specific combination of selection pressures and genetic mutations over millions of years.
耐药比率的主要驱动因素不是新的突变，而是抗菌素的选择压力和耐药微生物的传播。
The main drivers of resistance rates are not new mutations but rather antimicrobial selection pressure and transmission.
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