空腔

例句：

1. 1. The hole in the wall was filled with sand and water.
   墙上的洞被沙子和水填满了。
2. 2. The empty space between the two chairs is too small for a person to sit down.
   两把椅子之间的空间太小，一个人坐不下。
3. 3. The hollow sound of the bell echoed through the hall.
   钟声在大厅中回荡，发出空洞的声音。