Objective To study the epidemiological features in harmful dust workplaces and silicosis in gem processing workers (GWS) in Guangdong.

目的摸清广东省宝石加工工作场所粉尘危害和宝石加工工人矽肺(GW S)的发病特征。

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Safe and harmless: fiber cement flat without any harmful radiation, theprocess of using no harmful dust, and therefore can be used in a variety of buildings.

安全，无害：纤维水泥平板没有任何有害辐射，使用过程也没有有害粉尘，因此可广泛用于各种建筑物中。

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The suit also protects them from harmful radiation and fast-moving space dust.

宇航服还能保护他们免受有害辐射和快速移动的太空尘埃的伤害。

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Miners and chemical workers are at risk of COPD from breathing dust and harmful chemicals.

VOA: special.2010.06.23

Miners and workers in chemical industries also are vulnerable because of their exposure to dust, harmful chemicals and fumes.

VOA: standard.2010.06.21

Analysis of the dust material over the weekend indicated that it does not contain material that is seriously harmful to health.

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