salad什么时候是可数名词

　　例句：

　　On the menu is wiener schnitzel and potato salad.

　　菜单上有维也纳炸小牛排和土豆沙拉。

　　I decorated the fruit salad with a sprig of mint.

　　我用小薄荷枝装点水果色拉。

　　She picked up the bag of salad and gave it a shake.

　　她拿起了那袋沙拉摇了摇。