你有没有在网站上看到过那些奇怪的方块条形码，不知道他们是用来干什么的？

Have you ever seen those odd looking square barcodes on a website and wondered what the heck they where for?

youdao

你有没有在网站上看到过那些奇怪的方块条形码，不知道他们是用来干什么的？

Have you ever seen those odd looking square barcodes on a website and wondered what the heck they where for?

youdao