underdidv.不尽全力做(少做； 使 ... 做得不够； 使 ... 不煮透)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underspecified systems不明确系统undertakings of sports体育事业underexcited operation欠励磁运行under power protection低功率保护装置under the pretext that以…为借口under buildings mining建筑物下采煤undertaking employment用工underdetermined system欠定组underlying commodities基础商品,相关商品underwriting guarantee承保保证书