1. The divers discovered various underdrifts of debris on the ocean floor.
潜水员在海底发现了各种各样的水下漂流物。

2. The underdrift of the river carried the fallen leaves downstream.
河流的水下漂流物把落叶带到了下游。

3. The underdrift of the current created a whirlpool in the river.
水流的水下漂流物在河流中形成了一个漩涡。