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Docker port mapping deeply principle

After I understand with the document:https://docs.docker.com/engine/userguide/networking/
I draw this picture:

and I can understand the connection between
instance & docker process: iptables dnet
docker bridge network & docker container: native bridge network

but I don’t know the connection between:
nginx & docker container
docker bridge network & docker process

hi, folks, anyone knows the connection? That is to say how a data packet was transfer from external network to our application Nginx? Many thanks for you guys.