Taw qhia: Flanges, txawm hais tias feem ntau tsis saib xyuas, ua lub luag haujlwm tseem ceeb hauv ntau yam kev lag luam suav nrog kev tsim khoom, kev tsim kho, thiab kev tsim vaj tsev. Cov khoom tseem ceeb no yog siv los txuas thiab ruaj ntseg sib txawv ua ke, muab kev ruaj ntseg thiab ua kom muaj kev ua haujlwm ntawm cov tshuab. Mas wh...
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