You've got to put more pressure on one side than the other if you want to push that gas through the throttle, right? So this is where the time scale issue comes into play.

如果你想让更多的气体通过节流阀,应该使一边的压强,大于另一边，是吗？所以这就是,时间尺度发挥作用的地方。

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With the engine running, he can see on-screen how much fuel should be injected given X throttle pressure or Y coolant temperature.

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As water is flowing, the throttle is manipulated to control the water pressure being supplied to the discharges, this in turn affects the flow rate.

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