Bacteria are red and replication error machinery--markers for mutation- are the yellow dots.

细菌是红色的，复制错误机制——突变的标记——是黄色的点。

To counteract this risk, coronaviruses have a unique feature: an enzyme that checks for replication errors and corrects mistakes.

为了抵消这种风险，冠状病毒有一个独特的功能：一种检查复制错误并纠正错误的酶。