keep upWiktionary 原文构词拆分keep词根/词干+up词根/词干演变路径（由近及远）英语继承自 ←中古英语 kepen up “to perpetuate, maintain, preserve”词源说明From Middle English kepen up (“to perpetuate, maintain, preserve”), equivalent to keep + up.释义（英文）动词 Verb(transitive) To maintain; to preserve; to prevent from deteriorating or falling.(transitive, idiomatic) To continue with (work, etc).(intransitive, idiomatic) To maintain position; to prevent oneself from falling behind; to stay even or ahead of another while walking, driving, etc.