It has solved the problem of reclamation of return sand, and it has remarkable economic as well as society benefits.

解决了旧砂回用问题，具有显著的经济效益及社会效益。

youdao

It has solved the problem of reclamation of return sand, and it has remarkable economic as well as society benefits.

解决了旧砂回用问题，具有显著的经济效益及社会效益。

youdao