an acrobatic feat in which a person balances on the head (usually with the help of the hands)
headstand详细解释
head.stand n.（名词）A position, as in gymnastics or yoga, in which one supports oneself vertically on one`s head with the hands braced for support on the floor or on a mat.倒立：体操或瑜珈功中头手垂直支撑身体于地或垫子上的一种姿势
