kernel tyrosinase

例句：

1. 1.The kernel of the problem lies in this area.
   问题的核心在于这个地区。
2. 2. The scientist discovered a new type of kernel.
   科学家发现了一种新的核。
3. 3.The kernel of the problem is that we need to find a solution.
   问题的核心是我们需要找到一个解决方案。