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(1)July 31, 2018. KBS News
(2)The surface temperature of the head went up to 50 degrees
(3)July 31, 2018. KBS News
(4)The surface temperature drops to 306 degrees
(5)You can feel the amazing effects of mass production right away!
(6)a black umbrella
(7)Results of UV protection effect test JAMA Dermatology 2013
(8)Compared to mass production, it has about 90 UV protection effects
(9)Black umbrella is okay, too
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