Tips 1. formal "multi-layer" mask has more than 12, mask soft, elastic, thick-even, with no apparent agglomeration body.

贴士1。正规的“多层”口罩有12层以上，口罩手感柔软、富有弹性、薄厚均匀、没有明显结块体。

youdao

Tips 1. formal "multi-layer" mask has more than 12, mask soft, elastic, thick-even, with no apparent agglomeration body.

贴士1。正规的“多层”口罩有12层以上，口罩手感柔软、富有弹性、薄厚均匀、没有明显结块体。

youdao