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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
