flatfoot

例句：

1. 1.The patient had a flatfoot and couldn't walk properly.
   病人有扁平足，走路姿势不正确。
2. 2.The doctor told the patient to wear orthotics for their flatfoot.
   医生告诉病人要穿矫形鞋来治疗他们的扁平足。
3. 3. Flatfoot can lead to pain in the feet and ankles if not treated properly.
   如果不妥善治疗，扁平足可能会导致脚和脚踝疼痛。