她喜欢用小火慢慢炖鸡肉，这样会更入味。

She prefers to ___stew the chicken on low heat for better flavor.

她一直为考试结果而焦虑不安。

She was ___stewing about the exam results all day.

这道牛肉炖菜需要小火慢炖两小时。

This beef ___stew needs to simmer on low heat for two hours.