sand sole

1. Unfortunately a grain of sand remained rubbing the sole and became increasingly telling so that each step meant a twinge of pain.
   不幸的是有一粒沙子还留在鞋子里并磨脚，让他每一步都很痛。

noun

1. a common flatfish of the Pacific coast of North America

   Synonym:    Psettichthys melanostichus