A technology in a relay system for relaying communication data between a plurality of domains by an address translation, is capable of executing, even when there are both streams of inter-domain and intra-domain communications, the communications with security ensured without setting a complicated packet filter between the domains, and routing a packet at a high speed within the domain. The casing includes a set of electrical connections including at least one radio-frequency differential line between the chamber and the casing exterior. The insert includes an insert supporting surface and a clamping surface for clamping the insert relative to a toolholder such that the insert supporting surface supports the insert against an abutment surface of the toolholder. The computer-based imaging system can be further replaced by a compact and low-cost imaging circuit that functions reliably in a buoy with relatively low power consumption. The plastic films, fibers and articles with antimicrobial activity exhibit superior resistance to discoloration, may be processed at high temperature, and maintain physical properties upon weathering, especially upon exposure to ultraviolet radiation.