Txhawm rau kom tau raws li cov txheej txheem nruj zuj zus tuaj, asphalt mixers, uas yog cov khoom siv Ephalt, yog tas li kuj hloov kho. Kev tsim khoom siv tsis siv neeg sab nrauv Txawm hais tias siv yog tib yam, lub sijhawm tsis siv neeg ntsug spinal tov yog pom zoo dua li cov khoom siv ib txwm muaj. Yog li muaj cov kev cai tshwj xeeb rau nws siv?

Tov khoom siv tsis siv neeg Vim yog kev saws me nyuam thev naus laus zis, nws yooj yim ntxiv rau kev siv. Tom qab tig ntawm lub hwj chim hloov ntawm lub siab tsis siv neeg ntsug splyal tov, siv tus kov mus hloov mus rau qhov ntsuas kub mus rau qhov ntsuas kub. Tsuas yog nias lub khawm pib thiab lub tshuab yuav pib ua haujlwm.
Cov lauj kaub sib xyaw ntawm cov khoom siv hluav taws xob tsis siv neeg Yog tias muaj lub zog hluav taws xob thaum ua haujlwm, nco ntsoov tua lub zog hloov mus thiab siv phau ntawv ua haujlwm rau kev nplawm.