stale check

例句：

1. 1.The bread was stale when I got home.
   我回家时面包已经变旧了。
2. 2.The meat in the fridge is stale.
   冰箱里的肉已经变质了。
3. 3. The old books are stale compared to the new ones.
   旧书与新书相比显得陈旧。