细胞极其复杂，它执行的功能类似于一座尖端科技的工厂。
A cell is extremely complex and the way it performs its functions is similar to a sophisticated factory.
由于一般构件的几何形状和荷载状态复杂，难于对裂纹尖端的应力应变状态得到理论解。
Because of complexity of geometric shape and loading state for general component, it is difficult to gain theoretical solution to the state of stress-strain for cracking tip.
同样的，好的设计人员也会避免复杂尖端的特性，因为他们知道这些特性无法运行良好。
The same way good designers avoid very sophisticated features because they know they will never work very well.
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