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Cov lim dej UV hauv Kev Lag Luam Saib Xyuas Hnub
Kev saib xyuas lub hnub, thiab tshwj xeeb tshaj yog kev tiv thaiv lub hnub, yog ib qho ntawm cov ntu loj hlob sai tshaj plaws ntawm kev lag luam saib xyuas tus kheej. Tsis tas li ntawd, kev tiv thaiv UV tam sim no tau suav nrog rau hauv ntau hnub...Nyeem ntxiv