Static type of an object is the same as its dynamic type.
对象的静态类型与动态类型相同.
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Adds a new constructor to the dynamic type.
向动态类型中添加新的构造函数.
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In chapter eight we add dynamic type checking to catch our mistakes earlier on.
在第八章我们增加动态类型检测来及早的捕获错误.
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Some programs need to directly interrogate the dynamic type of an object at run time.
一些程序需要在运行时直接询问对象的动态类型.
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