"以铁丝围起的" can be translated into English as "enclosed by wire" or "fenced in with wire". Both expressions convey the idea of something being surrounded or bounded by wire. For example:
The garden is enclosed by wire. （花园以铁丝围起。）
The construction site was fenced in with wire for safety. （为了安全，建筑工地以铁丝围起。）