hollow block

例句：

1. 1. The builders used hollow blocks to build the walls.
   建筑工人使用空心砖块来建造墙壁。
2. 2. The hollow block was a perfect fit for the window frame.
   这个空心砖块完美地适配了窗户框架。
3. 3. The hollow block is easy to install and requires minimal maintenance.
   这种空心砖块安装方便，维护需求小。