名词
中文翻译：平缝线
同义词：
['straight seam', 'straight stitch']
例句：
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1.The dress has a flat seam that runs down the center of the back.
这件衣服有一个平直的缝合线，沿着后背的中心线。
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2. The seamstress carefully sewed the fabric together to create a perfect fit.
裁缝仔细地把布料缝在一起，制作出完美的合身。
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3. The shirt had a flat seam that was visible through the fabric.
这件衬衫有一个平直的缝合线，穿过布料可见。