Raws li cov xov xwm tsis ntev los no, kev lag luam qhov cub hluav taws xob tau hloov pauv tseem ceeb, thiab cov khoom tshiab tau tsim tawm rau cov neeg siv khoom qis hauv Asia, North America, Africa thiab lwm thaj chaw.Cov khoom tshiab yog cov khoom siv hluav taws xob ua ke thiab cov rooj saum toj kawg nkaus, txhawm rau muab cov tshuaj pheej yig ...
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