Each microdot is the size of a grain of sand and contains an identifier.
Each microdot is the size of a grain of sand and contains an identifier.
每颗微粒都是一粒沙粒的大小并且包含一个辨识码。
Each microdot is the size of a grain of sand and contains an identifier.
每颗微粒都是一粒沙粒的大小并且包含一个辨识码。