Kev lag luam kho vajtse yog ib qho tseem ceeb ntawm kev lag luam thoob ntiaj teb, suav nrog ntau yam khoom xws li cov cuab yeej, tshuab, khoom siv hauv tsev, thiab lwm yam. Qhov kev lag luam no ua lub luag haujlwm tseem ceeb hauv kev loj hlob thiab kev loj hlob ntawm ntau yam kev lag luam xws li kev tsim kho, kev tsim khoom, thiab infr ...
Nyeem ntxiv