drift exploration

例句：

1. 1. The boat drifted slowly downthe river.
   船慢慢地在河里漂流。
2. 2.The ship drifted away from the shore.
   船从岸边漂走了。
3. 3. Thecurrent was strong enough tocarry the driftwood downstream.
   水流足够强劲，把漂流木冲到了下游。