illustration of plesiosaurus skull with arrows showing direction of air inhaled in through mouth and exhaled through nostrils - 眼窩 幅插畫檔、美工圖案、卡通及圖標
medicine, anatomy, illustration, drawing, detailed representation of the sawed-through upper jaw and the nasal cavities, oral cavity and maxillary sinuses, with captions, hard palate, nasal septum, upper nasal concha, eye socket, frontal sinus - 眼窩 幅插畫檔、美工圖案、卡通及圖標
