#1 Surgical mask 

医用外科口罩

It usually has three layers. It is a basic defense against some viruses.

医用外科口罩通常有三层，能基本防御某些病毒。
 
#2 N95 mask/respirator 

N95型口罩

It is a safety device that covers the nose and mouth and helps protect the wearer from breathing in some hazardous substances. It is designed to filter out at least 95% of the dust and mold in the air.

N95型口罩是一种保护鼻子和嘴巴的安全口罩，有助于保护佩戴者，防止吸入一些有害物质。它能过滤掉空气中至少95%的灰尘和霉菌。
 
#3 Cold weather face mask 

保暖口罩

It can protect you from cold and wind. It is usually made of wind-breaking material like nylon blends. But it doesn’t help much in the context of virus.

保暖口罩可以在寒冷和大风的天气里保护你，通常是由防风材料如尼龙混合物制成。但是在病毒环境下，它没有多大帮助。
 
#4 Activated carbon mask

活性炭口罩

Mask with a charcoal filter cuts out odours effectively making it ideal for general purpose, especially suitable for use across various industries such as engineering, manufacturing, pharmaceuticaland many more.

带有活性炭的口罩可以有效去除异味，非常适用于一般用途，尤其适用于工程、制造、制药等行业。

你分清这几种口罩了吗？