"Instead of nesting definitions" in docs

On this page: https://react.dev/learn/your-first-component

When a child component needs some data from a parent, pass it by props instead of nesting definitions.

all of a sudden, it says, "instead of nesting definitions". Can you explain in the docs more what is "nesting definitions" and how does it work to "attempt to pass some data and doesn't work or shouldn't be done"? I have never heard of "nesting definitions" after working with React for a few years.

从 https://react.dev/learn/your-first-component 上的 “Your First Component” 页面开始，找到包含 “instead of nesting definitions.” 的句子。查看链接的 “Passing Props to a Component” 页面以了解上下文，然后阐明嵌套定义是什么意思，以及为什么更推荐使用 props。当 React 用户能够理解这句话和预期的数据传递指导时，即视为完成。