无防撞物的

例句：

1. 1.The car collided with the treeand burst into flames.
   汽车与树相撞后起火燃烧。
2. 2. Theimpact of the new policyhas been felt across the country.
   新政策的实施已经在全国范围内产生影响。
3. 3. Thebumper was dented by the collision.
   碰撞导致保险杠凹陷。