pith part

例句：

1. 1. The apple is a small fruit with a hard pith and a juicy flesh.
   苹果是一种小水果，有硬的果仁和多汁的果肉。
2. 2. The pith of the potato is used to make chips.
   土豆的果仁被用来制作薯片。
3. 3. The pith of the melon is soft and sweet.
   瓜类的果仁是软而甜的。