Flexible joint ndi cholumikizira chomwe chimakhala ndi ntchito yosinthika, koma kwenikweni, chimatanthawuza cholumikizira chachitsulo, chomwe ndi cholumikizira cholumikizira mphira komanso cholumikizira mphira. Zolumikizana zosinthika, monga momwe dzinalo limatanthawuzira, ndi zolumikizira zomwe zimakhala ndi ntchito zosinthika, koma zenizeni, nthawi zambiri zimatanthawuza kusinthasintha kwachitsulo ...
Werengani zambiri