Peb lub hnab jumbo loj tsim tuaj yeem ua pov thawj rau qhov zoo tshaj plaws particle qhov ntau thiab tsawg thiab cov ntaub ntawv tiv thaiv zoo li qub yog tias xav tau.Nws yog qhov yooj yim rau kev xa cov khoom siv hmoov, muaj cov yam ntxwv ntawm cov ntim loj, lub teeb yuag, yooj yim thauj khoom thiab unloading, thiab yog ib qho ntawm cov khoom ntim khoom siv.