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 size(人)矮小

1. This drug should only be taken under the supervision of a doctor.
   此药须遵医嘱服用。
2. The administration of oxygen requires a physician's order except in an emergency.
   除紧急情况外，输氧需遵医嘱。