drift of ship position

例句：

1. 1. The ship drifted aimlessly in the open sea.
   这艘船在广阔的海洋中漫无目的地飘荡。
2. 2. The current was carrying him downstream.
   水流正把他带向下游。
3. 3. The river flows through the valley, providing a natural boundary for the town.
   这条河流穿过山谷，为小镇提供了自然的边界。