洛杉矶，开普敦和多伦多都属于高排量的城市。其余的都处于平均水平。
Los Angeles, Cape Town and Toronto were among the high emitters. The rest fell in between.
讨论了二从动轮式复合齿轮泵的结构原理，导出了排量、平均流量、瞬时流量和流量脉动率的计算公式。
This paper analyzes the flow pulsation in a compound gear pump with 2-idlers, derives formulae for calculating displacement, average flow velocity, instantaneous flow and pulsation flow.
讨论了二从动轮式复合齿轮泵的结构原理，导出了排量、平均流量、瞬时流量和流量脉动率的计算公式。
This paper introduces the working principle and deduces the equations of geometric flow, average flow, instantaneous flow and the pulsation of the pump.
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