（注：这里有个小插曲。我后来发现在 Canvas 里直接复制全文，有时竟然也能成功保留所有格式。不过，因为 Canvas 呈现的是渲染后的富文本，没法直观地核对 Markdown 标记。为了保险起见，我还是习惯让它在对话框里多输出一遍源码，反正顺手的事，有备无患。）
Appending ? to a Result or ?T expression unwraps the success case and propagates the failure case. If the value is ok(v) or some(v), it evaluates to v. If the value is err(e) or none, the current function returns immediately with that error or none.，更多细节参见新收录的资料
Floyd's son Dan bought Twig's in 1986 to keep it in family hands. Today, it is run by Ben, his wife Annelies, and Ben's brothers Jake and Luke. It employs 20 people, and has annual revenues of around $6.5m (£4.8m).，详情可参考新收录的资料
输入：num = "1432219", k = 3
21:05, 2 марта 2026Спорт