Everyone has slight differences in the shape of pinnas.
每个人的耳廓形状都略微有些不同。
2
The pinnas are the distinctive ridges in your outer ear.
耳廓是外耳两边明显的脊状物。
3
By temporarily altering the shape of the pinnas with plastic molds, researchers in the Netherlands found that indeed, people with new pinnas had a hard time locating sound sources.