Donau

例句：

1. 1. The Donau River flows through the heart of Austria.
   多瑙河流经奥地利的心脏地带。
2. 2. The Danube is one of Europe's longest rivers.
   多瑙河是欧洲最长的河流之一。
3. 3. The Danube is famous for its scenic beauty and historical significance.
   多瑙河以其风景优美和历史意义而闻名。