她正在用小火慢慢煮这道菜。

She is ___simmering the dish over low heat.

尽管她保持着微笑，但我能看出她内心正压抑着怒火。

Though she kept smiling, I could tell she was ___simmering with hidden anger.

他们的矛盾已经酝酿了好几个星期。

Their conflict has been ___simmering for several weeks.