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首句一看就知道这段是讲触觉，touch并且发现有个but转折，在转折前说触觉有时被描述为很弱的，转折后说这是错误的，表明这段后面要具体证明这一观点。最后一句也是在具体讲解触觉这个感官。
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读首句就可看出这段讲的是视觉。最后一句提到了balee
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