1. The milk had been left out for too long and had turned rancid.
这牛奶被放在外面太久了，变质了。

2. The smell of the rancid meat made my stomach turn.
那肉腐败的味道让我恶心。

3. The rancid oil in the frying pan ruined the taste of the food.
煎锅里的变质油破坏了食物的味道。

4. The rancid odor coming from the garbage can was unbearable.
垃圾桶散发出的腐臭气味令人无法忍受。

5. It is important to properly store food to prevent it from becoming rancid.
妥善存放食物以防止变质是非常重要的。

6. The rancid butter had to be thrown away because it was no longer safe to eat.
那块变质的黄油必须扔掉，因为它不再安全食用。