作案时,罪犯往往注意不留下自己的指纹,殊不知耳朵、气味、体温都会暴露他的身份。在电视、电影中,我们经常看到警方用指纹或DNA寻找罪犯,但随着科学的发展,警方不断开发出新的手段来破案、缉拿真凶,让罪犯难逃法网。 When committing the crime, criminals are often careful not to leave their fingerprints, not knowing ear, smell, body temperature will reveal his identity. In television and movies, we often see police searching for criminals by fingerprints or DNA. However, with the development of science, the police have continuously developed new means to solve crimes and arrest culprits so that criminals can not escape the law.