Attempt to "merge" two containers by iterating `source` and extracting all nodes in `source` and inserting them into `*this`.
Attempt to "merge" two containers by iterating `source` and extracting all nodes in `source` and inserting them into尝试“合并”两个容器:遍历 `source`,提取 `source` 中的所有节点,并将它们插入到 `*this`.中。
Attempt to "merge" two containers by iterating `source` and extracting all nodes in `source` and inserting them into尝试“合并”两个容器:遍历 `source`,提取 `source` 中的所有节点,并将它们插入到 `*this`.中。