Thu?c very long ??m ho?c tiêu ??m ???c s? d?ng ?? làm l?ng ch?t ti?t ra t? niêm m?c ph? qu?n và khí qu?n.Encyclopaedia Britannica's editors oversee issue spots in which they've got intensive knowledge, whether from decades of encounter received by working on that articles or through study for an advanced degree. They generate new articles and