我对这场战争了解的不多,但我知道美国的很多年轻人都参与了这场战争。
I do not know much about it, but I think some of America's best young men served in this war.
Perception is the result of the activity of the five senses; through sensation, we come to know the world.
桥梁不仅是一种结构,也是人类进步的象征。