PCR

例句：

1. 1. The PCR test is used to detect the presence of a specific virus in a sample.
   聚合酶链反应测试用于检测样本中特定病毒的存在。
2. 2. The PCR technique has revolutionized medical research by allowing for more accurate and sensitive detection of genetic mutations.
   聚合酶链技术通过允许更准确和敏感的检测基因突变，使医学研究发生了革命。
3. 3. In this study, we applied PCR to analyze the DNA sequences of various species.
   在本研究中，我们应用聚合酶链技术分析各种物种的DNA序列。