Txawm hais tias koj yog ib tus neeg nyiam caij tsheb kauj vab, tus kws tshaj lij kev saib xyuas, lossis tsuas yog xav paub txog cov khoom siv tshuab, kev paub txog kev ua neej nyob ntawm koj cov menyuam saw tseem ceeb heev.Cov menyuam chains yog siv nyob rau hauv ntau yam kev lag luam thiab kev siv, xws li tsheb kauj vab, maus taus, industrial machinery thiab agri ...
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