Pem teb hom ntawv tso saib khib
qhov loj ntawm cov qauv ntawm cov ntawv tso saib khib feem ntau yog ua los ntawm qhov siab tag nrho ntawm qhov loj me thiab cov neeg laus (1.7 meters) .Paub zaub khib yog siv los tso saib cov khoom lag luam rau kev txhawb nqa. Yog tias qhov siab siab dhau lossis qis dhau, nws yuav cuam tshuam ncaj qha rau cov txiaj ntsig ntawm kev txhawb nqa cov neeg siv khoom' ob lub qhov muag tshwj xeeb, xws li pawg neeg siv khoom yog menyuam yaus, yog li qhov siab yuav tsum zoo ib yam li menyuam yaus' kab ntawm qhov pom qhov siab tsim nyog.
