基本解释adj.单程的(直通的;一次操作的;一回的)同根派生 oncethrough相关词英汉例句Keywords deepening of vertical shaft;lifting of cage;safty turnover board;oncethrough shaft; 竖井延深;罐笼提升;安全翻板;一次成井;oncethrough boiler 直流式锅炉oncethrough更多例句