Feem ntau, thaum cov tswv tsev tab tom nrhiav cov qhov rooj sab nraud hloov chaw, lawv tsis quav ntsej txog kev ntaus hluav taws. Qhov laj thawj yuav yog tias lawv paub lub zog ntawm cov qhov rooj hlau thiab tias lawv tsis tuaj yeem hlawv cov qhov rooj ntoo. Txawm li cas los xij, ib qho uas koj yuav tsum paub yog tias qee qhov rooj yog tsim nrog nyias cov hlau ntsuas hluavtaws, thiab lawv yuav tsis muaj kev tiv thaiv tib yam li cov ntsuas cua. Lawv kuj tsis muab cov neeg nyob nrog lub sijhawm txaus tawm hauv chav nyob rooj plaub ntawm kev kis hluav taws.
Yog li, thaum xaiv cov qhov rooj steel, saib cov qhov rooj nrog ntau dua 20- gauge steel tawv. Lub qhov rooj yuav tsum muaj kev ntsuas hluav taws ntawm tsawg kawg 20 feeb. Uas muaj cov neeg nyob hauv lub tsev ntau dua los tawm hauv chav nyob thaum muaj teeb meem hluav taws, txuag tau lub neej.
