特殊用法internal flexion1.内部屈折radical flexion1.词根屈折thematic flexion1.语干屈折, 构干屈折flexion of hip joint1.大腿屈(屈髋)flexion of knee joint1.屈膝flexion of upper limb1.上臂屈flexion of surface1.曲面的拐度flexion of vertebral column1.脊柱前屈