Ob Lub Ntsiab Lus Tsim Nyog Thaum Vuam Cov Khoom Hlau Nrog Laser Vuam Tshuab
Cov kev ceev faj uas lub tshuab vuam siv lub tshuab laser xav tau thaum vuam cov khoom siv hlau, tsuav yog nws yog ib yam uas tuaj yeem siv tau los ntawm kev siv vuam ib txwm
