The fact that your yogurt has live bacteria inside of it might sound kinda gross.

其实酸奶里满是活性菌听起来有点恶心。

In fact, some of our food, like cheese and yogurt, is deliberately inoculated with live bacteria.

因为有些食物，如奶酪、酸奶，必须得借助活菌才能做出来。

You can get it from oysters or from swimming with an open wound in brackish water where the bacteria lives.

人们通常会因为吃生蚝感染这种病菌，或者在身上有开放性创伤的情况下，到该细菌生长的半海水水域游泳时受到感染。

Then they dropped the plasmid into a living bacterium, or yeast.

然后他们将质粒放入活细菌或酵母中。