empty step

例句：

1. 1. The room was empty exceptfor the bookshelf.
   除了书架，房间是空的。
2. 2. The factory had toempty its shelves of inventory.
   工厂不得不清空其库存。
3. 3. The old house was empty, and it felt eerie.
   这所旧房子空着，感觉很奇怪。