empty string

例句：

1. 1. The room was empty except for the books on the shelves.
   除了书架上的书，房间是空的。
2. 2. The table was empty except for a few crumbs.
   除了几块面包屑，桌子是空的。
3. 3. The house was empty when we arrived, but it soon filled with guests.
   我们到达时，房子是空的，但很快充满了客人。