发源于

• originate from
• take its source at

例句

1. 多瑙河发源于德国，流经欧洲中部的9个国家，在罗马尼亚汇入大海。
   Crossing9 nations in the center of Europe from its German source to its Romanian mouth, flows the Danube river.
2. 这条河发源于群山之中。
   The river takes its rise in the hills.
3. 莱茵河发源于何处？
   Where is the source of the Rhine?