SRL for [backed]: That strip of concrete is [backed] up by a few one - story , air - conditioned shacks where a handful of American nationals -- buttressed by imported food , cold soft drinks and back issues of Sports Illustrated -- maintain radio contact with the outside world .
ARG-1: That strip of concrete | ARG-0: by a few one - story , air - conditioned shacks where a handful of American nationals -- buttressed by imported food , cold soft drinks and back issues of Sports Illustrated -- maintain radio contact with the outside world