请帮小学六年级中国学生学习这篇英文阅读理解,分析内容中重要的的词汇,表达和语法。---Wherever he steps, whatever he touches, whatever he leaves will serve as silent evidence against him. Not only his fingerprints or his footprints, but his hair, the fibers from his clothes, the blood that he deposits or collects—all these and more bear mute witness. This is evidence that does not forget. It does not get confused. It does not refuse to testify. It is factual evidence. Physical evidence cannot be wrong. Only its interpretation can err. Only human failure to find, study and understand it can diminish its value. Paul Kirk, *Crime Investigation: Physical Evidence and the Police Laboratory* (New York: Interscience Publishers, Inc., 1953)

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