因此经常要调整控制钮，以维持恒定的输出压力。
Thus, frequent adjustment of the control knob is required to maintain constant delivery pressure.
通过调整控制钮，第二级把中间压力降到需要的输出压力。
By adjusting the control knob, the second stage reduces the intermediate pressure to the desired delivery pressure.
这些较新式的电视机的色彩已经调定，你不必老去动控制钮。
On the newer television sets, the colour is locked in so that you don't need to keep changing the control.
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