constructional material

例句：

1. 1. Theengineers are constructing a new bridge over the river.
   工程师们正在建造一座横跨河流的新桥。
2. 2. The architect designed the building with careful consideration of its structural material.
   建筑师在设计建筑时仔细考虑了其构造材料。
3. 3. The construction of this new city will require extensive use of constructional material.
   这座新城市的建设将需要大量使用构造材料。