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问题: 帮忙分析一下句子关系

Surrounded by ever-greater stimulation, their young faces were looking disappointed and bored.
请问两句话之间是什么关系?是转折吗?

能通过语法来分析吗?

解答:

“Surrounded by ever-greater stimulation”过去分词做让步状语,属于非谓语。