drift and toxicity problem of

例句：

1. 1. The boat was drifting slowly down the river.
   船在河里慢慢地漂流。
2. 2. The ship drifted away from the shore.
   船从岸边漂走了。
3. 3. The car drifted off the road and hit a tree.
   汽车偏离了道路，撞上了一棵树。