Kev ntsuas PH yog cov txheej txheem tseem ceeb hauv ntau yam kev lag luam, xws li kev ua liaj ua teb, kev kho dej, kev ua zaub mov, thiab kev tshawb fawb tshawb fawb.Kev kuaj PH raug yog qhov tseem ceeb los xyuas kom meej cov khoom zoo, kev ua haujlwm zoo, thiab kev nyab xeeb ib puag ncig.Rau cov lag luam thiab cov koom haum xav tau kev ntseeg siab ...
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