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
周期的英语翻译：
cycle; period; wheel 【计】 C; cycle time; loop cycle; periods 【化】 period 【医】 cycle 【经】 cycle; period