Fold along the bottom (the middle line from the pattern,) pin the straps in place (two ends of one strap in each seam) and match up the edges.

底部(从模式中线)折脚有何带(两带之一，每缝完)和匹配的边缘。

youdao

The structure and dimension of welding pin are the main factors which affects the flow direction of the plastic metal in FSW zone and the quality of the FSW seam.

焊接过程中搅拌焊针的结构形状是影响焊缝区塑性软化材料流动方式的主要因素，从而影响焊缝的成型质量。

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Marjorie was no longer as adept as she had been when she was younger and able to unroll a bolt of cloth and see every seam and dart, every buttonhole and facing, when she could tell, even before putting one pin into the cloth, how it would all fall together.

NEWYORKER: The Visitor