alluvial fan deposit

例句：

1. 1. The alluvial fan deposit in the riverbed provides a unique habitat for many species of plants and animals.
   河床中的冲积扇沉积物为许多植物和动物提供了独特的栖息地。
2. 2.The alluvial fan deposit is an important source of minerals for mining operations.
   冲积扇沉积物是采矿作业的重要矿物来源。
3. 3. The alluvial fan deposit contains a rich variety of organic materials that have been transported from the surrounding areas.
   冲积扇沉积物中含有丰富的有机材料，这些材料是从周围地区运输过来的。