通风。检查一下通风口或调风器，保证没有堵塞的东西。

Ventilation. Check the vents/registers and make sure there is nothing blocking them.

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不要堵塞进风口或出风口，以免降低净化效果和损坏产品。

Please do not block the air inlet or outlet in case of reducing purifying effect and damaging the product.

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当通风口被堵塞时，发动机就会停转。

When the vent became plugged, the engine would stop.

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