... flat butted seam 对头接缝 flat felled seam 明包缝 flat folded seam 平折缝 ...
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flat envelope folded seam 平折缝
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For his twelfth birthday, Sandy had gotten a large, flat black portfolio made of hard cardboard that folded along a sewn seam and was secured at the top edge with two attached lengths of ribbon that he tied in a bow in order to fasten the leaves.
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