drift of strata

例句：

1. 1. The river is drifting downstream.
   河流正在向下游漂移。
2. 2. The ship drifted away from the shore.
   船正从岸边漂移开去。
3. 3. The tide is causing the sand to drift in a long curve.
   潮水正导致沙子以长曲线漂移。