![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
Translation from English into Chinese: In the second step,the temperature is lowered by refrigeration. As the temperature drops, the growth of the streptococcus thermophilus slows, and a mesophilic bacterium called bulgaria lactobacillus beginning to ferment the remaining lactose in the milk.