▌呼吸阀
exhaust valve / exhalation valve
例句:
►This model comes with an exhaust valve, which offers improved comfort, especially for those having difficulty to breath comfortably while wearing the masks.
这个型号的口罩带有呼吸阀,佩戴起来更舒适,对于那些戴着口罩呼吸不畅的人来说尤其如此。
口罩的功效
人们通常从以下几个方面来测试口罩是否好用。
▌Comfort 舒适性
例如:
►These masks are usually very comfortable on the face. But their straps go behind the head and not around the ears, which is less practical for many users.
这些口罩佩戴起来通常很舒服,但是带子是箍在头上,而不是耳戴式,所以对有些人来说不是很好用。
►This mask is usually very comfortable but the plastic edges can leave skin indentations which last longer than other softer masks.
通常来讲,这种口罩佩戴起来很舒适,但是塑料边缘会在皮肤上留下印记,和其他柔软材料的口罩相比,印记消掉要花更长的时间。
▌Air leaking 密封性
例如:
►There is very little leaking if the metal nose bridge is properly pinched together.
如果把金属鼻夹夹紧的话,空气几乎不会漏进来。
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