打开应用底部的「设置」，在语言列表中选择你需要的语言即可。切换后，界面文字、国别名称、朝代名称、帝王名号与生平介绍会一并切换。

应用首次启动时会自动跟随系统语言。

Open Settings from the tab bar and pick a language from the list. Switching changes the interface, country names, dynasty names, imperial titles and biographical texts all at once.

On first launch the app follows your system language automatically.

不需要。所有帝王资料、世系数据与人物图像都内置在应用安装包中，完全离线可用，也不会消耗你的流量。

No. Every profile, lineage chart and portrait is bundled inside the app itself. It works completely offline and uses no mobile data.

涵盖中国历代王朝，以及日本、朝鲜半岛、越南、泰国、印度、波斯、阿拉伯、奥斯曼、拜占庭、罗马、埃及、西欧与东欧等地区的主要政权。各国古代政权按自身的历史分期编排，中国部分则按传统朝代顺序展开。

It covers the successive dynasties of China together with the main sovereign houses of Japan, Korea, Vietnam, Thailand, India, Persia, the Arab world, the Ottoman Empire, Byzantium, Rome, Egypt and both Western and Eastern Europe. Each region follows its own historical periodisation, while China is arranged by the traditional dynastic sequence.

不会。应用没有账号系统，也没有任何服务器。你在应用内选择的语言偏好只会保存在本机，不会上传到任何地方。详情请见隐私政策。

No. The app has no account system and no server of any kind. The only preference it stores — your chosen language — stays on your device and is never uploaded anywhere. See the Privacy Policy for details.

历史资料难免存在疏漏或争议。如果你发现问题，欢迎发邮件到下方联系邮箱，并请注明国家／朝代名称、帝王姓名以及你认为正确的内容。我们会核实后在下个版本中修正。

Historical records are inevitably open to gaps and disagreement. If you find a mistake, please email us at the address below with the country or dynasty, the ruler's name, and what you believe the correct information to be. We will verify it and correct it in a following release.

请先尝试以下步骤：

1. 确认系统版本为 iOS 17.0 或更高。
2. 从后台完全关闭应用后重新打开。
3. 前往 App Store 检查是否有新版本。
4. 卸载并重新安装应用（不会丢失任何数据，因为应用没有本地个人数据）。

如果问题仍然存在，请发邮件告知我们你的设备型号、系统版本以及具体操作步骤。

Please try the following first:

1. Make sure you are running iOS 17.0 or later.
2. Fully close the app from the app switcher and reopen it.
3. Check the App Store for a newer version.
4. Delete and reinstall the app — no data will be lost, as the app keeps no personal data locally.

If the problem persists, please email us with your device model, iOS version and the exact steps that trigger it.

没有。应用不含任何内购项目、订阅、广告或第三方统计 SDK。

None. The app contains no in-app purchases, subscriptions, advertising or third-party analytics SDKs.