My advice to them at this point is to keep up the good work and then pray to the Mongolian Weather Gods to send cold fronts. That's their best hope for clean air.

我在这点上给他们的建议是保持良好的工作然后祈祷蒙古天神送来冷气流。这是他们对清洁空气的最好的祝福。

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Who knows when you might want to clean your filter or front element that has become moist from going in and out of cold temperatures?

你不知道什么时候可能要清理滤镜或者镜头盖之类，因为在寒冷的环境中，镜头很容易变得潮湿。

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Cold plasma, a combination of oxygen and helium gas concentrated into a lightening-like beam, has previously been used by medics to clean bacteria off wounds.

冷等离子，是由氧气和氦气混合集中成的光束，先前主要在医疗上用来清除伤口的细菌。

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So if kept very clean and very cold and handled with care, fresh tuna can be enjoyed medium rare, rare or even raw.

CNN: Tuna making a splash in popularity

Grit can get trapped in the mushrooms' nooks and crannies, so give them a swish in a bowl of cold water, then repeat with fresh water until the water runs clean and let them air dry in a single layer on kitchen towels.

WSJ: Stuffed Morels | Consider This