M?t s? hi?u ?ng, ch?ng h?n nh? gi?m huy?t áp, ???c nhìn th?y g?n nh? ngay l?p t?c.Encyclopaedia Britannica's editors oversee subject parts by which they've got considerable knowledge, whether from decades of practical experience obtained by working on that content material or by means of review for a complicated degree. They write new content and