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Txhim Kho Koj Cov Txheej Txheem Txhaum Txhaum Cai: Lub Ntsiab rau Cov Khoom Siv Zoo Lub chaw tsim khoom sai tau hloov pauv ntau. Nws yog ib qho tseem ceeb kom tau txais cov khoom mus rau hauv kev ua lag luam sai li sai tau hauv kev lag luam nrawm no. Cov kws tsim qauv, engineers, thiab cov neeg tsim khoom yuav tsum ua tib zoo xyuas kom lawv cov khoom muaj siab ...