It allows Cell views to be cached until an attached versioning method decides to expire it, without loosing the object-oriented features of a Cell instance.
This enables the cell to capture material from the extracellular environment and to respond to cues detected by externally oriented receptors.
这就使细胞能从细胞外的环境中捕获原料，并且回应那些能被外部指向型受体接收的信息。
3
Using object oriented method the manufacturing system is abstracted and generalized, the function model and data model of the cell controller are established.