In vain they rush frantically round from place to place,trying to escape from acenging boredom by mere clatter and motion.
不可以。这里,in vain 是修饰全句的,包括现在分词的内容。如果放在分词的逗号之前,说明只能修饰前文,不修饰分词,句意会差别很大。区别对照如下:
In vain they rush frantically round from place to place, trying to escape from acenging boredom by mere clatter and motion.
他们疯狂地从一个地方跑到另一个地方,企图以闲聊和乱窜来摆脱无聊,这是徒劳的。
They rush frantically round from place to place in vain, trying to escape from acenging boredom by mere clatter and motion.
他们徒劳地疯狂地从一个地方跑到另一个地方,企图以闲聊和乱窜来摆脱无聊。
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