这不是整句,只是短语.carried round是radios的后置定语,在公共场所被携带着到处走的大收音机.
看原文： The survey revealed a large number of sources of noise that we really dislike.
后面例举的都是我们不喜欢的噪音源,都是逗号分隔开的并列短语：
Lawn mowers whining on a summer’s day, late-night parties in apartment blocks,..., large radios carried round in public places