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交換原理
Wikipedia definition
1. Locard's exchange principleThe Locard exchange principle, also known as Locard's theory, was postulated by 20th century forensic scientist Edmond Locard. Locard was the director of the very first forensics laboratory in existence, located in Lyon, France. Locard's exchange principle states that "with contact between two items, there will be an exchange" (Thornton, 1927) and is known most commonly as the idiom "Every contact leaves a trace. " "Everywhere you go, you take something with you, and you leave something behind.
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