The bag could never be made in practice, however, because it required infinitely thin material.
但这种袋子却不可能出现在现实中，因为它要求材料无穷薄。
In the blanking of thin material, blanking dies without clearance are usually chosen.
在冲裁薄料时，通常要用的是无间隙的冲模。
In the blanking of thin material, blanking dies without clearance are usually chosen.
在冲裁薄料时，通常要用的是无间隙的冲模。
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