Next, the sound makes its way to the cochlea, which is a hollow, spiraled bit of bone that's full of fluid and lined with thousands of microscopic hairs.

接下来，声音进入耳蜗，耳蜗是空心的、螺旋状的骨头，里面充满了液体，并有成千上万的细绒毛。

For example, a difference in air pressure between the outside and those little hollow bits in your skull called sinuses can lead to a pretty bad headache.

例如，外部气压与头骨中称为鼻窦的那些小空心部位之间的气压差异会导致严重的头痛。