"Decrease" is better because it describes the pressure, not the indicator that monitor the pressure.
A使用"降低"更好，因为他描述的是压力，而不是控制压力的指示器。
B使用"降低"更好，因为它描述的是压力，而不是监测压力的显示器。
C使用"增加"更好，因为它描述的是压力，而不是监测压力的显示器。
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Decrease is better because it describes the pressure, not the indicator that monitor the pressure.
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