耳轴

例句：

1. 1. The doctor examined the patient's ear and found a small bump on the axis.
   医生检查了患者的耳朵，发现耳垂上有一个小凸起。
2. 2. The musician played his instrument with great precision, aligning the axis perfectly.
   这位音乐家演奏乐器时非常精准，将轴对齐得恰到好处。
3. 3. The scientist used a microscope to examine the axis of a fossil bone.
   科学家使用显微镜来检查化石骨骼的轴线。