### Chinese: 使用混凝土模块筑建检查井的优势在于模块的上下左右四周均为凹凸槽结构，组合砌筑形成链锁。
### English: The advantage of using concrete modules to build inspection wells is that the top, bottom, left<v> and</v> right sides of the module are concave and convex grooves, and the combined masonry forms a chain lock.

### Improved English: The advantage of building inspection shafts using concrete modules is that the four sides of the modules are of concave groove structures, which are built to form chain locks.
