如图示美国飞行器制造商研发的世界首款飞行汽车﹣Transition，他拥有两个座位，四个轮子和能够折叠的一对翅膀，既能像轿车一样在公路上行驶，又能像飞机一样上升、下降、悬停、飞行．飞行汽车能够在机场和任何道路上行驶，采用汽油发动机，汽车启动后助跑一段距离就可起飞，请参照示例写出该飞行汽车所涉及的物理信息和对应的物理知识（不得与示例重复）．

示例：物理信息：飞行汽车上升．

物理知识：力可以改变物体的运动状态．

作答：物理信息：____；

物理知识：____．

    Last week, we asked some students about how to1 friends and if friends should 2the same or different. Here is what one of the students said.

    Jeff Green, a shy boy, said he is quieter and more serious than most kids. That's3he likes reading books and studies much 4 in class. He and his friend Yuan Li have one thing in 5: they are both quiet. Jeff thinks friends are like books — you don't need a lot of them, as long as they are good.