There is no sheet of cells out there, but a tightly packed data structure of values, with various pointers between them, from which the program synthesizes a new image to display in real time.

• 实际上没有单元格，只不过存在一个紧凑的数据结构，以及它们之间的指针。 基于这些，程序实时合成出一个新的图像来显示而已。