underpann.底盘(拖盘)
underprep.低于;在 ... 下;在 ... 内;在 ... 控制下adv.在昏迷中;在 ... 下adj.下面的;从属的;少于的
under commission from奉 ... 命令
under favour of night在夜色掩护下
under coating varnish打底漆
undercarriage bracing起落架拉条
underslung powerplant悬挂式动力装置
under public scrutiny<名人等> 在众人注视之下
under passing railway下穿铁路
undercompound winding低复绕法
under-strean period开工期
underglaze decoration釉底装饰