premium grades

英 [ˈpriːmiəm ɡreɪdz]

美 [ˈpriːmiəm ɡreɪdz]

网络  优等品

化学

双语例句

• An essential difference between "premium" and "regular" grades of kerosine is that the former has a higher smoke-point.
  高档与中档煤油的根本差别在于前者比后者的发烟点高。