spread a small clew

例句：

1. 1.The news spread quickly throughout the city.
   这个消息迅速在整个城市传开。
2. 2. The teacher spread the lesson across the board.
   老师把课程内容讲解得非常透彻。
3. 3. The fire spread rapidly across the forest.
   大火迅速蔓延至森林。