Dust masks are graded according to the protection they offer.
防尘面具根据其提供的防护而分级。
They are much more effective than the standard surgical masks or dust masks that are sometimes used by builders.
它们比标准的外科口罩或有时建筑工人使用的防尘口罩要有效得多。
Thee market for dust masks and air purifiers is booming in Beijing because the capital has been shrouded for several days in thick fog and haze.
近几日北京持续被浓重雾霾笼罩，市场上防尘口罩和空气净化器的销量剧增。
The workers wear masks to avoid inhaling the dust.
工人们戴着面罩避免吸入尘土。
The U. S. Environmental Protection Agency obliges contractors to do lead-safe renovations on pre-1978 homes, isolating rooms where work is under way and using special vacuums and masks for dust.
美国环境保护署敦促承建商对1978年前建成的房屋进行铅安全的整改工作，把正在施工的房间隔离开，同时使用真空蒸发器和面具防止铅尘弥漫。
Meteorologists advised the public to wear face masks to ward off dust.
气象学家建议公众外出时戴口罩。
Note to wear anti-dust clothes, masks, gloves and glasses, etc.
注意穿戴防尘土的衣服、面罩、手套和眼镜等。
None wore face masks, despite a pall of silica dust in the air, and some said they had not showered in years.
尽管空气中到处漂浮着粉尘和沙土，但他们没有一个人戴有防护面具，其中有一些人还说他们已经几年没洗过澡了。
Even if we wore double gauze masks while searching, our nostrils were very black as they were filled with dust.
即使我们在翻找的时候罩了两层纱布，鼻孔里还是吸满了黑黑的灰。
Cotton masks, protective glasses and gas mask should be provided for laborers working in conditions of health-harming gas, steam or dust.
在有危害健康的气体，蒸汽或者粉尘的场所操作的工人，工厂应分别供给口罩，防护眼镜和防毒面具。
Cotton masks, protective glasses and gas mask should be provided for laborers working in conditions of health-harming gas, steam or dust.
在有危害健康的气体，蒸汽或者粉尘的场所操作的工人，工厂应分别供给口罩，防护眼镜和防毒面具。
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