Aluminium pas nrig taub qab vuam tshuab yog cov neeg ua haujlwm txhim khu kev qha hauv ntau qhov chaw muaj kev lag luam, kom ntseeg tau tias kev sib koom ua ke ntawm aluminium rods. Txawm li cas los xij, zoo li lwm yam khoom siv, lawv xav tau kev saib xyuas tsis tu ncua kom ua haujlwm tau zoo thiab txuas ntxiv lawv lub neej. Hauv tsab xov xwm no, peb yuav tshawb nrhiav qhov tseem ceeb ...
Nyeem ntxiv