Ib qho kev lag luam viav vias yog ib qho chaw ntawm cov pob zeb loj heev Nws cov lus sib dhos oscillating kom thov kev siv cov khoom sib xyaw ua ke ntawm cov khoom siv roj av, ua kom muaj ntau yam khoom siv ua kom zoo dua qub khib nyiab .}}}}} kev tsim cov khoom siv khib nyiab, xws li muaj cov khoom siv tsim tsev, xws li cov nroj tsuag tsim khoom, lub viav vias puab lub puab tsaig lub ntsej muag yog tseem ceeb} Nws yog lub luag haujlwm rau kev tsim cov khoom sib xyaw ua ke kom muaj kev siv pob zeb ua kom zoo nkauj thiab kev sib txhuam ntawm kev kho mob Kev siv hluav taws xob ntau ntxiv, tsis sib xws Qhov ntau thiab tsawg, thiab kev npaj ua kom tau txais cov khoom lag luam ntau lawm, thiab ua kom cov khoom lag luam zoo tag nrho, thiab ua kom cov khoom lag luam zoo tag nrho}
Hauv cov theem nrab ntawm cov theem, viav vias lub pob tsaig plooj kom haum rau kev hloov pauv hloov ua kom zoo nkauj hauv kev ua kom zoo nkauj hauv kev tsim kho cov nroj tsuag tsis zoo hauv kev tsim kho cov nroj tsuag .
Cim npe nrov: Viav Pob Zeb Puab Phaj, Tuam Tshoj Viav Pob Zeb Phaj Tuam Txhab, Tus neeg muag khoom, Hoobkas
