Definition: a substance made of other substances that have been combined Level: B2
将面粉、水和酵母的混合物放在温暖处静置四个小时。
The ___mixture of flour, water and yeast is then left in a warm place for four hours.
向混合物中加入牛奶，搅拌至顺滑。
Add milk to the ___mixture and stir until smooth.
混凝土是沙、水泥和水的混合物。
Concrete is a ___mixture of sand, cement, and water.
