下阀芯起开关作用。

The lower valve core performs a switching function.

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它在开关门时的摇晃使得开门不方便，但是它们确实起作用。

They make the door difficult to swing open and close, but they work.

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限位行程开关，起到安全和限位作用。

Limit travel switch, play safe and limit the role of.

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这个浮球是一个直接作用的浮控开关。

The float is a direct acting float switch.

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这些受体的作用类似于开关；

These receptors act as on-off switch;

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这些受体的作用类似于开关；

These receptors act as on-off switch;

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