building-up by welding

例句：

1. 1. The construction of the new bridge began last month.
   上个月开始了这座新桥的建设。
2. 2. The engineers are building up the foundation for the new project.
   工程师们正在为新项目打下基础。
3. 3. The team is building up a strong network of contacts in the industry.
   团队正在建立行业内的坚实联系网络。