把它们混在一起

mix up───混淆；拌和；调和

mix ups───混淆；拌和；调和

mix-uped───混淆；拌和；调和

pick up the tab───承担费用

dominant theme───主题

familiar theme───熟悉的主题

You know from experience if you've ever mixed them to make salad dressing, they don't mix too well. And you may know that if you heat them up, they mix much better.───经验告诉我们，你无法把它们混合做成色拉酱调料，他们不会很好的混合，但是你也知道，如果我们把他们加热，就能够混合的更好。

Be careful not to mix them up.───要注意不能将它们混用。

Each day, you would choose one of the meals from each category (more from the snacks), or mix them up if you like.───每天，你需要从每类食物中选择一份(点心多选几份)食用，或者混在一起吃。