While digging the trench, the mortar mixed with special cement was also prepared by the machine. A layer was laid on the bottom of the trench, and then pieces of square bluestone were laid. This stone is extremely hard and is the best for building city walls. Good stones have long been prepared in large quantities in the space bracelets....
本网站所有内容均收录于互联网相关站点，本站不提供影片资源储存也不参与录制与上传，若本站收录内容侵犯了您相关权益，请给我们留言，我们将及时进行处理。
