Second, Erhai sea level dust less, air fresh, causes the water and sky to serve as contrast, the moonlight is brighter.

洱海海面尘埃较少，空气清新，使得水天相映，月光更加明亮。

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The self cleaning technology can repel dust when sensors detect concentrations on the panel's surface have reached a critical level.

当传感器发现面板表面的灰尘浓度达到一定水平时，自我清洁技术可以将其清除。

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Sensors detect when dust concentrations reach a critical level and then an electric charge energises the material sending a dust-repelling wave across its surface.

当传感器发现粉尘浓度达到了临界水平，就有一定的电荷促使该材料发出除尘波越过其表面。

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The new safety level is about 100 times higher than the background level of dust at ground level.

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That approach has allowed them a level of mobility that leaves other robots in the dust.

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"Apparently, those did not show any elevated level of concern, especially for asbestos, in the dust, " he said of the Brooklyn samples.

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