Peb tau cog lus rau kev tshawb fawb thiab kev txhim kho cov thev naus laus zis ntawm qhov tob, tsim kho tshiab tas li, tsim thiab tsim ntau yam tshuab laum phom thiab cov khoom lag luam cuam tshuam. Tsis tas li ntawd xwb, peb kuj tuaj yeem hloov kho cov khoom siv ua qhov tob tshwj xeeb, cov tshuab txiav tshwj xeeb, cov khoom siv kho, cov cuab yeej ntsuas, thiab lwm yam rau cov neeg siv khoom.