concrete labor

例句：

1. 1. The construction crew is hard at work on the new bridge.
   施工队正在努力建造这座新桥。
2. 2. The concrete laborers are putting in a lot of effort to finish the project on time.
   混凝土工人正努力按时完成这个项目。
3. 3. The concrete laborers have been working tirelessly for over a week now.
   混凝土工人已经连续工作了一周多。