Dung' la` dan^ tri' Vietnam cho den ngay hom nay van khong tien bo^. gi hon hoi truoc, chuyen vat lieu^. cua? chiec man` ta.o ra electric vao mua kho^ lanh ma` cung cho la` chuyen huyen bi' phai di nho'` den Tien^' si~ giai thich. bo' tay luon...(vn nen nho' rang, tuy theo vat^. lieu^. cua chiec man` moi co the^? tao. ra electric ma` muon tao ra electric thi phai vao mua dong^ khong khi' kho^ va lanh. khong tin thi thu'? dung` chiec man` do vao mua he` di coi co xay ra chuyen " huyen bi'" khong? ngay ca phong vien viet bao' ma cung khong biet dieu nay.bo' tay dan vn ta luon!!!