be rotten at the core

例句：

1. 1. Thefood was rotten and had to bethrown away.
   食物腐烂了，不得不扔掉。
2. 2. The old treewas rotten and needed tobe cut down.
   那棵老树腐烂了，需要砍掉。
3. 3. The meatwas rotten and would not keep well.
   肉烂了，保存不了多久。