Nyob rau hauv lub ntiaj teb no ntawm metalworking, ob peb cov cuab yeej yog ib qho tseem ceeb thiab ntau yam zoo li lub dov zeb. Tshwj xeeb tshaj yog nyob rau hauv lub teb ntawm precious hlau, cov cav tov no ua lub luag hauj lwm tseem ceeb nyob rau hauv shaping, refining thiab txhim kho qhov zoo ntawm kub, nyiaj, platinum thiab lwm yam ntaub ntawv. Seb koj yog ib tug neeg Yudais muaj kev paub ...
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