biogenic dam的用法和樣例：
例句
- The river keeps rising and the dam is threatened.
河水不斷上漲，大堤出現險情。 - This is the present riverway of the lower reach.Since then, people began to build more dams to prevent against floods, which caused the sedimentation of mud and sand on the dam.
自此以後，人們築堤防洪，河流泥沙被約束在堤內大量沉積，導致河床日益淤高。
