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undersaturated liquid欠饱和液体underprivileged class弱势阶层under-expanding jet欠膨胀射流under one's signatureunderdeveloped cities欠发达城市under-rate sampling欠采样undercolor separation欠色彩分离法underapplied expenses[经] 少分配(制造)费用under the auspices ofadj.由 ... 主办(在 ... 保护下)under-actuated ship欠驱动船舶