?. The code snippet provided appears to be a partial CSS code with some issues. Here's the corrected and translated version in English:
```css
.gallery {
margin: auto;
}
```
### Explanation:
1. **`.gallery`**: This is a class selector in CSS that applies styles to all elements with the class name `gallery`.
2. **`margin: auto;`**: This property centers the element horizontally if it has a defined width.
### Note:
- The original code had a typo (`；` instead of `;`). In CSS, you must use a semicolon (`;`) to separate properties, not a full-width semicolon (`；`), which is invalid and will cause the CSS to fail.