adj. 用过的;习惯于;二手的;旧的;
v. 使用( use的过去式和过去分词);常常,经常;
"Things ain't what they used to be."
现在情况不比从前了。
近义:outworn, worn, utilized, wonted, accustomed
反义:unused, unworn
n. 视觉, 视力, 观看\\nconj. 鉴于
近义:percept, perceptibility, perception, awareness, sense, sensing