发动机里的蒸汽压力由这个按钮控制。
The pressure of steam in the engine is controlled by this button.
蒸汽压力或给水压力下降。
这台蒸汽机的蒸汽压力是由这个按钮控制的。
The pressure of steam in the engine is controlled by this button.
这台蒸汽机的蒸汽压力是由这个按钮控制的。
The pressure of steam in the engine is controlled by this button.
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