concrete mixing machine

例句：

1. 1.The concrete mixing machine is used to mix the concrete.
   混凝土搅拌机用来混合混凝土。
2. 2. The concrete mixing machine was invented by a man named John.
   混凝土搅拌机是由一个叫约翰的人发明的。
3. 3. The concrete mixing machine is essential for construction projects.
   混凝土搅拌机对于建筑项目来说是必不可少的。