back margin

• 背脊边缘

back margin的用法和样例：

例句

1. He put one knee on the fish and cut strips of dark red meat longitudinally from the back of the head to the tail.
   他将膝盖压在鱼身上，从鱼头一直到尾巴，沿着背脊往鱼肚的边缘切下一条条深红色的鱼肉。