搅拌时加入玉米淀粉有助于汤汁的浓稠。

Adding cornstarch while stirring helps with the ___thickening of the soup.

制作酱汁时，我通常用面粉作为增稠剂。

When making sauce, I usually use flour as a ___thickening agent.

加入面粉使汤汁变得浓稠。

Adding flour helped with the ___thickening of the soup.