extra,walker-on是什么意思

用法例句

Temporary Revascularization of Limb Replantation;

断肢再植术中血运的临时重建

Brief discussion on design of temporary power supply in build constructing scene;

浅谈建筑施工现场临时供电的设计

Objective Discuss the applicative value of temporary cardiac pacing in perioperative period of the patient with heart disease.

目的　探讨临时心脏起搏器在心脏疾病患者围手术期中的应用价值。