blank seam

例句：

1. 1. The dress has a blank seam where the sleeves should be attached.
   这件连衣裙的袖子应该缝合的地方有一个空白缝线。
2. 2. The seamstress was so skilled that she could finish the job with just one pass.
   这位裁缝技艺高超，只需一次缝制就能完成工作。
3. 3. The fabric was too thin for a proper blank seam, so we had to use a thicker thread.
   这种布料太薄，不适合做完整的空白缝线，所以我们不得不使用更粗的线。