So Quality Functions are presented to define wrinkle, flat area, fracture and springback tendency etc.
为此，本文提出了质量函数的概念，并对起皱、 平台区、破裂及回弹等常见缺陷进行了定义。
The target material used for video disk is liable to fracture in production, the higher the density, the stronger is the fracture tendency.
此光盘膜用靶材材料极易在制备过程中碎裂，并且密度越高，裂纹倾向越大。
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