每次修改堆中对象中的指针字段时，就在卡片映射中设置对应那张卡片的相应位。
Each time a pointer field in an object in the heap is modified, the corresponding bit in the card map for that card is set.
规定与这个映射相关的Form bean的值应该可以保存多少位。
Specifies how long the values of a form bean, associated with this mapping, should be saved.
因此，提供64位的寻址和整数运算能力必须要修改现有数据类型的绑定或映射，或者向c语言中添加新的数据类型。
Thus, providing 64-bit addressing and integer arithmetic capabilities involves changing the bindings or mappings of the existing data types, or adding new data types to the language.
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