扁平足的

例句：

1. 1. He has a flat foot andneeds to wear special shoes.
   他扁平足，需要穿特殊的鞋子。
2. 2. Flatfeet are common in childrenwho are born with them.
   扁平足在出生时就存在的儿童中很常见。
3. 3. Doctors recommend exercises to help peoplewith flat feet improve their balance.
   医生推荐运动来帮助有扁平足的人改善平衡。