Jumar clamp上升器
Jumar Jose da Costa Junior俱乐部球星儒马尔
N（名词） a clamp with a handle that can move freely up a rope on which it is clipped but locks when downward pressure is applied (绳索的)上升器 (Also called jumar clamp) [mountaineering]
V（动词） to climb (up a fixed rope) using jumars 用上升器爬升