Yuav tsum muaj zog ib feem

Lub zog hais txog lub peev xwm ntawm ib feem kom tsis tawg lossis tsim yas deformation ntau tshaj qhov tso cai txwv thaum ua haujlwm.

Qhov no yog qhov xav tau tshaj plaws rau kev ua haujlwm ib txwm ntawm lub tshuab thiab kev tsim khoom nyab xeeb.