短语词组短语keep -up costs 维持成本keep a up 保持一个上升;保持向上;正在翻译Keep locked up 必须紧锁But keep it up 但是keep grades up 保持较好的中平均成绩keep popping up 此起彼伏keep sth up 遵守某事物Keep It Up Free 保持在上 返回 keep up