Streptococcus lactis

例句：

1. 1.This strain of bacteria is responsible for common colds.
   这种细菌是导致普通感冒的罪魁祸首。
2. 2.The researcher isolated the streptococcus and studied its properties.
   研究人员分离了链球菌并研究了其性质。
3. 3. The streptococcus can cause serious infections in humans.
   链球菌可以引起人类严重的感染。