buckwheat coal

例句：

1. 1.Buckwheat is a type of grain that is high in protein and fiber.
   荞麦是一种富含蛋白质和纤维的谷物。
2. 2. The buckwheat coal was used to make bricks for the construction of the new bridge.
   荞麦煤被用来制作砖块，用于建造新桥的建设。
3. 3.Buckwheat coal is a renewable energy source that can be used to generate electricity.
   荞麦煤是一种可再生能源，可以用来发电。