either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh
psoas详细解释
pso.as n.（名词）Either of two muscles of the loin that rotate the hip joint and flex the spine.腰肌：腰部的两块肌肉中的任一块，能使髋关节摆动并屈伸脊椎 来源：New Latin 现代拉丁语 from Greek psoa 源自 希腊语 psoa
