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In colds days, we will always find guards on their duty standing for hours，
”warmer” is a speciall Guard kiosk for them.On the top of the kiosk installi
-ng solar boards which will absorb sunlight in the daytime and then store
the energy.When cold days comming, The energy stored will be released
to warm the guards.
zhejiang sci-tech university
Ling’en Wang Guanghui Wen