The static means: Hosts on the dmz1 will be able to contact the hosts on the inside using their real addresses through the translation table in the firewall.
Host 10.10.10.1 will be known to the DMZ1 as 10.10.10.1 - host 10.10.10.2 will be known to the DMZ1 as 10.10.10.2 and so on to 10.10.10.254 being known to DMZ1 as 10.10.10.254.
