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Factors ntawm tsev cog khoom iav
Iav Migo yog ib tug ua tsev cog khoom iav chaw tsim tshuaj paus rau hauv Suav teb, tau muab lus hli 4 ntshiab ntab iav, hlau tsis ntab iav, tsis tshua muaj hlau patterned iav uas t