Ib lub khw muag khoom uas muag khoom yuav tsum tshaj tawm nws, uas yog qhov tsim nyog, tab sis peb tseem yuav txiav txim siab ntau ntawm cov ntsiab lus propaganda rationally. Piv txwv li, nrov heev "qhov rooj nres" tshaj tawm txhais tau tias ib lub sijhawm dhau los tsis yog kev tshawb fawb. Feem ntau thaum peb tham txog lub tsheb, lub qhov rooj khawm yog nquag tau hais qee yam txog cov ntu, tab sis kom pom kev tham, tsis tuaj yeem tham lus sib tham.
Muaj ob yam txuas txuas lub qhov rooj rau lub cev, ib tus yog hu ua pob khawm, raws li lub npe qhia, lwm tus yog kom txwv lub kaum sab xis qhib ntawm lub qhov rooj, cia lub pob khawm. Pob khawm yog ib feem tau hais tias yuav tsum tau pob khawm, muaj ob qho qauv sib txawv ntawm kev ua yeeb yam, stamping thiab casting, ntau hom pob khawm nro yog nraus khawm. Vim tias cov qauv tsim qauv sib txawv, yog li ob hom pob khawm tuab tsis zoo ib yam, nrum hinges ntau dua cov tuab dua li cov pob khawm hlau.
Nrum hinges muaj qhov zoo ntawm cov khoom lag luam tsim nyog thiab kev sib koom ua ke, nws yog qhov hnyav, tab sis tus nqi ntau dua yuav yog ntau dua; Tus nqi txheeb ze ntau lawm cov nqi khawm yuav qis, thiab yuav tsis muaj kev shrinkage rau kev siv tsev neeg cov tsheb, uas tuaj yeem ua tiav qhov kev thov.
