limb词根解释如下:

limb [英] [lɪm] [美] [lɪm] n.(人、四足动物的)肢, 肢体; (鸟的)翼 n.【天文】(日月等天体的)边缘; 【植】冠檐, 萼檐; (四分仪等科学仪器上测量角度的)分度弧 [短语] life and limb，out on a limb，tear someone limb from limb。