基于卡片的表单中的字段可以像表格中的单元格一样引用，可以包含数据，也可以包含能在运行时确定数据的表达式。
The fields in the card-based forms can be referenced like cells in a spreadsheet and can contain either data or an expression that determines the data at run-time.
在图中，蓝色的宽箭头表示页面转换，黑色箭头表示卡片调用，而桔红色虚线箭头则表示字段引用。
In the diagram, a thick blue arrow stands for page transition, a black arrow stands for card invocation, and an orange dotted arrow stands for field reference.
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.
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