Cov tshuaj tawv tawv: tus yuam sij rau kev tsim tawv nqaij kom ruaj khov Nyob rau xyoo tas los no, kev lag luam tawv tau nce siab rau kev ruaj khov, thiab cov tshuaj tawv tawv ua lub luag haujlwm tseem ceeb hauv kev ua kom tau raws li cov kev xav tau no.Nrog rau qhov no hauv siab, nws yog ib qho tseem ceeb los tshawb nrhiav cov xov xwm tshiab thiab cov ncauj lus hauv kev lag luam ...
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