定期大修

【化】 scheduled overhaul

定期的英语翻译：

【经】 at fixed period; at regular intervals; regular intervals; terminal

大修的英语翻译：

heavy repair; overhaul
【计】 major overhaul
【化】 capital repair; general overhaul; heavy repair; major overhaul
major repair; major service; overhauling
【经】 capital repair; maintenance overhaul; major overhaul; major repair
permanent repairs