一旦确定操作数和操作符后，就可以执行运算了，如清单12所示。
When we determine the operands and operator, we can perform the operation, as shown in Listing 12.
在转义了操作符后，它将像所有其他文字一样进行匹配。
After you escape the operator, it matches like any other literal.
你点了艺术家、封面、歌曲、类型或者播放列表旁边的三角符后，显示的选项少了。
When you click the triangle next to an artist, album, song, genre, or playlist, you'll get fewer options.
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