Dab tsi yog qhov txawv ntawm lub tshuab lim dej nrog thiab tsis muaj dej cia tank?
Qhov sib txawv ntawm ob yog qhov loj heev. Muaj 3 lub ntsiab lus, tsis txhob yuav qhov yuam kev. Ua ntej ntawm tag nrho cov, muaj qhov sib txawv ntawm cov nqi, cov uas muaj thoob yog pheej yig, thiab cov uas tsis muaj dej cia tank yog kim. Piv txwv li, ib hom kev lom zem zoo sib xws ...
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