Thaum xaiv cov hlua khi, nws yog ib qho tseem ceeb kom nkag siab txog nws qhov tseem ceeb hauv ntau yam kev lag luam.Cov menyuam chains yog siv dav hauv tsheb, kev ua liaj ua teb, kev lag luam, thiab txawm tias kev ua si.Los ntawm cov tshuab conveyor mus rau maus taus, cov menyuam chains ua lub luag haujlwm tseem ceeb hauv kev xa...
Nyeem ntxiv