用不透气不透水的薄膜材料覆盖在一个框架上形成罩子，罩子下边有密封环，可以阻止热气外泄。
The cover is formed by covering an airtight waterproof film on a frame. The lower edge of the cover is provided with a sealing ring which can prevent the external leakage of hot gas.
用不透气不透水的薄膜材料覆盖在一个框架上形成罩子，罩子下边有密封环，可以阻止热气外泄。
The cover is formed by covering an airtight waterproof film on a frame. The lower edge of the cover is provided with a sealing ring which can prevent the external leakage of hot gas.
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