| 1. | A giant model of the ear , for elementary science classes , shows the three main structural parts of the hearing organ ( external ear , middle ear , internal ear ) and the position of the equilibrium organ of human body
大型耳模型，适合初级科学课程使用，显示耳的内部构造及外耳、中耳、内耳和平冲器官的位置关系。 |
