Txhua yam khoom yuav tsum raug muag hauv lub khw kawg, xws li khw muag khoom, khw loj loj, khw muag khoom, los yog kev lag luam ncaj ncees. Yog hais tias qhov kev lag luam hauv khw muag khoom tsis ua hauj lwm zoo, ces qhov muag channel yuav tsum raug kaw los sis txawm tu ncua, thiab nws cov khoom yuav tsis muaj peev xwm ua kom tau zoo muag. Yog li ntawd, lub khw tshav dav hlau yog qhov chaw ntawm cov tub lag luam, uas tswj lub davhlau ya nyob twg uas yog tus khiav.
Qhov kev sib txuas kawg khw yog qhov kawg ntawm txoj kev muag khoom thiab qhov kawg "export point" ntawm cov khw muag khoom. Nws ua rau lub luag haujlwm tseem ceeb ntawm Shanglian cov tuam txhab, cov khoom muag, cov neeg sawv cev, cov neeg muag, thiab cov neeg siv. Lub dav dav, lub davhlau ya davhlau ya dav hlau "lub dav hlau" thiab "soft terminal": "nyuaj" , khw hauv khw, lub thawv rau khoom, lub vojvoog, cov chaw xa ntawv, khoom muag, khoom plig, cov hnub, tsev phom, thiab lwm yam. rau kev muag khoom muag.
Daim ntawv zoo tso zaub, daim ntawv txee thiab pem teb zaub muag zaub yuav txhim khu cov khoom hom duab thiab cov nqi ntxiv ntxiv, tsim ib qhov chaw zoo thiab ua kom cov neeg muaj mob xav tau. Piv txwv, lub zog ntawm cov khoom siv sib zog yog thawj zaug rau cov neeg tau txais kev nkag mus rau hauv lub khw. Lub sij hawm dhia mus rau hauv lub cev ntawm lub qhov muag, cov tshiab, cov tswv yim thiab zoo ntawm cov duab txee yuav yog qhov khoom kom sawv ntawm ntau lub npe sib tw, thiab ua tau rau thiab txhawb qhov kev paub txog qhov muag khoom dav muag; qhov tshwj xeeb lub rooj muag zaub ntawm lub rooj nthuav dav no tseem lav txog qhov yeeb yam tseem ceeb ntawm cov duab zoo ntawm cov tuam txhab thiab cov khoom.