If you mix something, you prepare it by mixing other things together.
调制 • He had spent several hours mixing cement. 他用了几个小时的时间来搅拌水泥。
A mix is a powder containing all the substances that you need in order to make something such as a cake or a sauce. When you want to use it, you add liquid.
(制作蛋糕或调味汁等的) 混合干配料