该设备为自主式，不需要换装燃料或燃气通风。

The units are completely self-contained and can be left unattended with no need for re-fueling or venting of combustion gases.

youdao

该设备为自主式，不需要换装燃料或燃气通风。

The units are completely self-contained and can be left unattended with no need for re-fueling or venting of combustion gases.

youdao