Cov khoom tseem ceeb ua haujlwm thiab cov cuab yeej rau kev nruam yas deformation ntawm hlau ntawm adov zeb.
Lub yob yog tsim los ntawm yob lub cev, yob caj dab thiab ncej taub hau.
Lub cev yob yog qhov nruab nrab ntawm cov yob uas tau koom nrog hauv cov hlau dov.