求翻译：在缺氧、有毒环境中，应佩带隔离式防毒面具或长管面具，禁止使用过滤式防毒面具进入受限空间。必要时作业人员应拴带救生绳并专人监护。是什么意思？

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The oxygen, toxic environment, should equip isolated gas masks or long tube masks, and prohibition of the Use Filter, gas masks in the restricted space. If necessary, the person should be tied with lifeline and dedicated monitoring.

In oxygen deficit, in the virulent environment, should wear the isolated-type gas mask or the long tube mask, the prohibition use filtration type gas mask enters is limited the space.When necessity the operating personnel should tie up the belt lifeline and the specialist guardianship.

In hypoxia, toxic environments, should wear isolation type respirators or long tube respirators, the prohibition of the use of filter type respirator entering the confined space. Workers should be tethered to a lifeline when necessary and special care.

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