con.stric.tor
n.（名词）One that constricts, as a muscle that contracts or compresses a part or organ of the body.收缩肌：收缩性事物，如收缩或压迫身体某部分或某器官的肌肉Any of various snakes, such as the python or boa, that tightly coil around and asphyxiate their prey.蟒：任一种蛇，如大蟒或蚺，能紧紧地缠绕其猎物并使其窒息
