名词
中文翻译：Unknown
同义词：
['straight seam', 'straight stitch', 'straight line']
例句：
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1. The dresshas a flat-fell seam that makes it easy to wear.
这件衣服有一个平直的接缝，穿着非常舒适。
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2. The carpenter used a flat-fell seam to join the wooden planks together.
木匠用平直的接缝将木板连接起来。
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3.The new shoes have a flat-fell seam that is comfortable to walk in.
新鞋有平直的接缝，走路很舒服。