Ib qho ntawm cov lus nug uas tib neeg feem ntau nug ua ntej sim kho lub teeb liab yog seb nws puas ua rau daim tawv nqaij raug rauCov teeb UVCov lus teb yogtsis yog - kev kho mob lub teeb liab tsis tso tawm cov hluav taws xob ultraviolet (UV).
Kev Kho Mob Liab puas muaj UV Rays?
7 Saib
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