把牛奶搅进去，直到酱汁变稠为止。

Stir in the milk until the sauce thickens.

《牛津词典》

加入番茄，当混合物开始变稠时，将其打成打成糊状的蛋白和鲜奶油。

Add tamarillos, and when mixture begins to thicken, fold in stiffly beaten egg whites and whipped cream.

youdao

汤中加些淀粉将变稠。

The soup will reduce by adding some cooking starch.

youdao

And I'm sure you don't remember, but one of the things I had in my recipe, is beat egg whites until stiff. OK.

我相信你们不记得了，但是我说过我食谱中的一件事情是，搅拌蛋清直到变浓稠，好。

麻省理工公开课 - 计算机科学及编程导论课程节选