• meta- prefix

at a higher level: (like the people in heaven)
metaphysical = beyond ordinary physical things
metaclass = super class

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• intermediate adj

an intermediate class is at a level of skill that is between the basic level and the advancen level

• a book amied at students at the intermediate level and above

  
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• invokeverb

to make spirits appear by using magic(syn call)

invoking the spirits of their ancestors

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• involuntary adj

an involuntary movement is one that you make suddenly and without intending to because you can not control yourself

when sheldon tapped on the window,lenard gave a involuntary jump

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• 对象 类的总结

对象有一个类，对象可以调用的方法都被类存储着，那么类也有类方法，类的方法被类的meta-类存储着，到了继承链最顶端，meta类就是自己