As the rod turns, LED light bounces off different parts of the fingertip, creating a series of linear images that are stitched together to form the fingerprint.

在短杆旋转的同时，LED光会从指尖的不同部份弹回来，制作出一系列线性影像，组合在一起就会形成指纹。

youdao

Looks like easy, though lot of parts need to be stitched.

看着还蛮简单的，虽然要绣的部分比较多。

youdao

Imagine a large cartographic quilt, tightly stitched in parts but with ragged and jagged edges, with bright patches and threadbare ones in the middle.

ECONOMIST: Ten years since the wall fell