If seams are not fell flat, you must ensure seams are serged to cover the raw edges.

如果接缝不是外包边，必须确保缝头锁边。

No raw edges shall be exposed.

不能有毛边外露。

The fabric is torn or cut along the crosswise grain, so that the yarns at the raw edges can unravel.

沿横丝绺将面料撕开或剪下。这样，毛边的纱线不会散开。

If seams are not fell flat, you must ensure seams are serged to cover the raw edges and thus prevent raveling.

如果接缝不是外包边，必须确保缝头锁边并遮住毛边防止散边。

French seams are a favored seam-finishing technique for designers, Roes explained, since the raw edges of the fabric are hidden in a neat finished seam.

罗埃斯解释说，法式接缝是设计师们喜欢的一种缝制技术，因为布料的毛边可以隐藏在整齐的包边里。