Thaum nws los txog rau kev tu tus kheej thiab kev huv, siv cov phuam uas siv tau pov tseg muaj ntau yam zoo dua li cov phuam da dej uas siv tau. Cov phuam so pov tseg tuaj yeem muaj ntau hom, nrog rau cov phuam da dej, phuam taub hau, thiab phuam da dej. Hauv tsab xov xwm no, peb tham txog cov txiaj ntsig ntawm kev siv cov phuam so pov tseg thiab ho ...
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