Vim qhov tshwj xeeb ntawm nws ib puag ncig, chav ua haujlwm ntawm lub tsev kho mob feem ntau xav kom lub qhov rooj ua haujlwm hauv chav ua haujlwm kom muaj kev ua haujlwm ntawm hermeticness, suab rwb thaiv tsev, kev txuag hluav taws xob, kev tiv thaiv siab, plua plav, tiv thaiv hluav taws thiab tiv thaiv hluav taws xob.Ho...
Nyeem ntxiv