Based on the study of features of sheet metal parts and Zero Thickness Hypothesis, a new mechanism of naming and identifying topological entities of a feature model is proposed in this paper.

本文在对钣金件特征研究和“零厚度”假设的基础上，提出了一种钣金件拓扑元素命名和辨别的新方法。

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Again, it is important not to exaggerate the risks, since common sense is also required in the paper world in identifying the party from whom a sheet of letterhead appears to originate.

再有一点是，不要夸大这种风险，因为在纸质环境下也需要使用常识来辨明谁看上去是开出带抬头信笺的当事人。

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