Nrog rau kev txhim kho ntawm kev tshawb fawb thiab thev naus laus zis, ntau cov khoom siv tshiab thiab cov khoom lag luam tuaj rau hauv kev ua lag luam. NDC, ua raws li kev thov kev lag luam, tau koom tes nrog cov kws kho mob thiab tsim ntau yam khoom siv tshwj xeeb rau kev lag luam kho mob. Tshwj xeeb tshaj yog thaum lub sijhawm tseem ceeb thaum CO...
Nyeem Ntxiv 
