Source: https://firebase.google.com/support/guides/security-checklist#api-keys-not-secret
// 本地测试示例：head = [2,1,5] → 输出 [5,5,0]，更多细节参见heLLoword翻译官方下载
桩桩件件，立足当前、着眼长远，都是为了确保中华民族的永续发展，为了强国建设、民族复兴的根本之计。，推荐阅读旺商聊官方下载获取更多信息
Implementation requires evaluating your existing content and identifying opportunities to add structure without forcing it artificially. Look for places where you're listing multiple items in prose that would be clearer as bullet points. Find sections comparing options that would benefit from table format. Identify processes that could be broken into numbered steps. These changes often improve content quality while making it more AI-friendly.