By implementing the plus and minus methods, I've overloaded both + and - and can now use them in my scripts. Listing 5 demonstrates their behavior to add and subtract songs from a play list.
通过实现plus和minus方法，我重载了+和-，现在可以把它们用在脚本中了。
User defined play lists - allows the user to create a personal play list.
用户自定义播放列表-允许用户创建个人播放列表。
User defined play lists - allows the user to create a personal play list.
用户自定义播放列表-允许用户创建个人播放列表。
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