He looked sadly at the leather covering the mount of the heel.

他惋惜地看着包鞋跟底的皮革。

And when someone says they have a leather interior in their car, it means that the seats, for example, are made out of leather, that they have leather coverings on them.

当有人说他们的车内有皮革内饰时，这意味着座椅， 例如，是用皮革制成的， 上面有皮革覆盖物。