天然的矿物之间可以互相混合，并且可以阻挡来自空气中的粉尘等垃圾，同时也让你的皮肤可以自由呼吸。
The nature of minerals allows them to overlap and provide protection from junk in the air, while still allowing your skin to breathe.
目的调查人造宝石厂和天然宝石厂粉尘危害情况。
Objective To survey the hazardous impact of gem dust on the health of workers.
天然气中的粉尘影响仪表、阀门设备正常运行。
The dust in natural gas severely affects regular operation of instruments and valves.
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