skeleton grain

例句：

1. 1.The grain was so fine, it felt like skeleton grains in my mouth.
   粮食太细了，感觉像骨头一样在我嘴里。
2. 2. The scientist used the skeleton grains to make a new type of fertilizer.
   科学家用这些骨骼颗粒制作了一种新型肥料。
3. 3. The farmer used skeleton grains as a substitute for animal feed.
   农民用这些骨骼颗粒作为动物饲料的替代品。