0 to make a place tidy by removing things from it or putting them where they should be -- 清除;清理;整理
1 If an illness clears up, or if medicine clears an illness up, the illness goes away. -- (疾病)消失,治癒
2 to give or find an explanation for something, or to deal with a problem or argument -- 把…解釋清楚;搞清楚;弄明白;解決