Txhawm rau txhim kho qhov tawv nqaij tawv thiab hnav tsis kam ntawm 16Mn cov kab plaub hau, kev kho saum npoo, xws li nplaim hluav taws kub, qhov kub ntawm qhov quenching, tshuaj kho cua sov, thiab lwm yam.Feem ntau hais lus, feem ntau ntawm ...
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