这种面具将口鼻完全遮盖，称为半面罩过滤呼吸器。
The mask covers the nose and mouth. These are called half-mask air-purifying respirators.
常见的全面罩过滤呼吸器，这里与提供更多保护头罩和防毒服配合使用。
A typical full-face air-purifying respirator, used here with a hood and suit for extra protection.
很多人都没有被告知什么时候更换安全面罩的过滤网。
Some are not instructed in when to change the filters on their safety masks.
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