... 双层电光机 duplex shreiner calcnder 双层皮带 double belt ;double layer belt 双层管道 double skin duct ...
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double layer belt
双层带
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The face mask consists of double-layer non-woven cloth in which filter layer, nose bridge bar and face mask belt is set, or is made of multi-layer medical absorbent gauze.
口罩由双层无纺布中间夹过滤层、鼻梁条和口罩带构成，或由多层医用脱脂纱布经缝制而成。
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