docs(en): merging all conflicts

Author: docschina-bot

src/content/learn/referencing-values-with-refs.md

@@ -287,7 +287,11 @@ console.log(ref.current); // 5
 
 ## ref 和 DOM {/*refs-and-the-dom*/}
 
+<<<<<<< HEAD
 你可以将 ref 指向任何值。但是，ref 最常见的用法是访问 DOM 元素。例如，如果你想以编程方式聚焦一个输入框，这种用法就会派上用场。当你将 ref 传递给 JSX 中的 `ref` 属性时，比如 `<div ref={myRef}>`，React 会将相应的 DOM 元素放入 `myRef.current` 中。你可以在 [使用 ref 操作 DOM](/learn/manipulating-the-dom-with-refs) 中阅读更多相关信息。
+=======
+You can point a ref to any value. However, the most common use case for a ref is to access a DOM element. For example, this is handy if you want to focus an input programmatically. When you pass a ref to a `ref` attribute in JSX, like `<div ref={myRef}>`, React will put the corresponding DOM element into `myRef.current`. Once the element is removed from the DOM, React will update `myRef.current` to be `null`. You can read more about this in [Manipulating the DOM with Refs.](/learn/manipulating-the-dom-with-refs)
+>>>>>>> 68f417a600c7d7b8c4131e39f8a843a856ae3909
 
 <Recap>
 

src/content/reference/react/useMemo.md

@@ -647,7 +647,11 @@ export default function TodoList({ todos, tab, theme }) {
 
 切换选项卡感觉很慢，因为它迫使减速的 `List` 重新渲染。这是预料之中的，因为选项卡 `tab` 已更改，因此你需要在屏幕上展示用户的新选择。
 
+<<<<<<< HEAD
 接下来，尝试切换主题。**感谢 `useMemo` 和 [`memo`](/reference/react/memo)，尽管被人为减速了，但是它还是很快**！由于作为依赖性传递给 `useMemo` 的 `todos` 与 `tab` 都没有发生改变，因此 `visibaleItems` 不会发生改变。由于 `visibleItems` 数组从上一次渲染之后就没有发生改变，所以 `List` 会跳过重新渲染。
+=======
+Next, try toggling the theme. **Thanks to `useMemo` together with [`memo`](/reference/react/memo), it’s fast despite the artificial slowdown!** The `List` skipped re-rendering because the `visibleTodos` array has not changed since the last render. The `visibleTodos` array has not changed because both `todos` and `tab` (which you pass as dependencies to `useMemo`) haven't changed since the last render.
+>>>>>>> 68f417a600c7d7b8c4131e39f8a843a856ae3909
 
 <Sandpack>