rennet curdling

例句：

1. 1. The milk was curdling before it reached the cheese maker.
   牛奶在到达奶酪制作者之前就开始起泡沫了。
2. 2. The farmer used rennet to make cheese, which is a common practice in many parts of the world.
   农民使用乳酶来制作奶酪，这是世界上许多地方的常见做法。
3. 3. The curdling process is essential for the production of cheese and other dairy products.
   凝结过程对于生产奶酪和其他乳制品产品至关重要。