果心

例句：

1. 1. The fruit is a perfect blend of sweet and sour flavors.
   这个水果是甜和酸味的完美结合。
2. 2. The kernel of the story is that he was not at home when the fire broke out.
   这个故事的核心是他当时不在家。
3. 3. The pit of my stomach felt like it was going to burst.
   我的胃里那个坑感觉要爆炸了。