empty space

例句：

1. 1. The room was empty except for a single chair.
   除了一把椅子，房间里空无一人。
2. 2. The scientist found an empty space in the data that needed to be filled.
   科学家在数据中发现了需要填充的空白区域。
3. 3. The teacher explained the concept of empty space in physics.
   老师解释了物理学中的空空间概念。