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Quay tr? l?i v? trí c? c?a b?n trong t? th? plank cao, sau ?ó l?p l?i ??ng tác ch?ng ??y. – L?c tách ly tâm m?: L??ng m? th?a hút ra s? ???c chi?t tách ly tâm ?? lo?i b? t?p ch?t và ch?n l?c các t? bào m? s?n