Corrosion tswj khoom
Raws li ib qho ntawm cov kws tsim khoom lag luam txhim kho cov khoom lag luam thiab cov neeg muag khoom zoo}}}} {}} .
Raws li ib qho ntawm cov kws tsim khoom lag luam txhim kho cov khoom lag luam thiab cov neeg muag khoom zoo}}}} {}} .