derivet除铆钉derivev.获取；得自；起源derived phrase structure派生短语结构derived utility function派生效用函数derived planning domains派生规划问题derived air concentration推定的空气浓度derived curve line-type导曲线线型derived rule of inference推理的导出规则derived physical quantity导出物理量derived channel equipment分路设备derived unit of measurement测量导出单位, 导出测量单位derive knowledge from books从书中获得知识