The starter cultures develop and multiply.

发酵剂培养并繁殖。

The cheesemaker adds starter cultures made from whey to mature the milk.

奶酪制造商添加由乳清制成的发酵剂来使牛奶成熟。

The milk is then poured into a huge vat where a starter culture of bacteria and a special enzyme called rennet are added in.

然后将牛奶倒入一个大桶中，其中添加了细菌发酵剂和一种称为凝乳酶的特殊酶。

What we do is we take the milk, we add a blue mold culture, starter culture to produce acidity, and then we add rennet, which will help us clot the milk and turn it into curd.

比利：我们所做的是取牛奶，添加蓝霉菌培养物、发酵剂以产生酸度， 然后添加凝乳酶，这将帮助我们凝结牛奶并将其变成凝乳。