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3:50

Faced with such serious smog and haze, a reporter from Henan speaks with residents about PM 2.5 masks that are useful for blocking dust and smog. A doctor is also interviewed about the effectiveness of such masks and how residents can prevent diseases caused by smog in their daily lives.

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1:17

This video introduces the basic parts of the guitar and what happens when you tighten or loosen its strings.

Showing 26 of 26 videos
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