加入蛋黄可以帮助油和水乳化，形成奶油状酱汁。

Adding egg yolk helps ___emulsify oil and water into a creamy sauce.

厨师用搅拌器将油和水乳化，制成光滑的沙拉酱。

The chef uses a blender to ___emulsify oil and water into a smooth salad dressing.