将清单9中所示的对象引用调用为变量将自动调用__invoke魔术方法，使类本身用作闭包。
Calling the object reference shown in Listing 9 as a variable automatically calls the __invoke magic method, making the class itself act as a closure.
因为使用经过 bless 的标量引用最常见的情形就是执行粘接魔术（glue magic），所以 Pixie 在缺省情况下会认为这些对象是不可存储的。
Because the most common case for using a blessed scalar reference is to perform glue magic, Pixie by default will consider these objects unstorable.
言谈中引用几句莎士比亚的名句。表演个扑克魔术，或者品评品评艺术。在任何尴尬的社交情景中，这些都无疑会为你打破僵局。
Quote Shakespeare. Do a card trick, or appreciate art. This will become your guaranteed ice breaker in any awkward social situation.
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