kernel of mass

例句：

1. 1.The kernel of the problem is that the data is incomplete.
   问题的核心是数据不完整。
2. 2.She ate a few kernels of corn from her bag.
   她从包里吃了几粒玉米。
3. 3. The farmer harvested the kernels of the crop.
   农民收获了庄稼的种子。