A “plus” sign in front of the number means you are farsighted, and a “minus” sign means you are nearsighted. These numbers represent diopters, the unit used to measure the correction, or focusing power, of the lens your eye requires. Diopter is often abbreviated “D”.比如某酒100毫升中纯乙醇含量为10毫升,这种酒的酒度就是10度。
例:By the time the fire engines got there, the whole building was already alight. 等消防车到那里时,整栋大楼都已经燃着了。
考研英语大纲词汇5500C-Dcab[kæb]n.出租车;驾驶室;轻便马车cabbage[ˈkæbɪdʒ]n.卷心菜,洋白菜cabin[ˈkæbɪn]n.小木屋;机舱,船舱cabinet[ˈkæbɪnɪt]n.内阁;贮藏橱,陈列柜cable[ˈkeɪbl]n.