即使那些通常在日常会话中能够富有表现力地运用手势的人，在听众面前讲话时也觉得双手成了笨拙的附属物。
Even people who normally use their hands expressively in everyday conversation seem to regard them as awkward appendages when speaking before an audience.
运用隐喻，能形象而概括地说明问题，使语言生动、鲜明、富有表现力与感染力。
By using the metaphor, we can epitomize problems visually, and can make language vivid, brilliant, and full of the expressive and infective forces.
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