英语翻译Suppose you are reading a book.Suppose,too,you suddenly

英语翻译
Suppose you are reading a book.Suppose,too,you suddenly close your eyes.Can you still see the book?"Of course not,"you will say.But can you tell why?You would probably say,"when I close my eyes my eyesight cannot get out of my eyes to get to the book."But this explanation is wrong.
You cannot see any object unless light from that object gets into your eyes.Some of the things you see give off light of their own.The sun,the stars,a lighted lamp are the examples that can be seen by their own light.Such things are luminous.Most of the things you see are not giving off light of their own.They are simply reflecting(反射) light that falls on them from the sun or some other luminous body.The moon,for example,doesn’t give off any light of its own.It is nonluminous.You see it because sunlight falls on it and some of it reflects in our direction.So moonlight is only second-hand sunlight.
When you look at a book,it sends some of the light which falls on it to your eyes,and you see the book.If light could be kept out from where you are so that there would be no light from the book to reflect,then you could not see the book even with your eyes wide open.
Light travels so fast that the time in which it travels from the book you are reading to your eyes is as short as if there were no time at all.Light reaches us from the moon,which is about 380 000 kilometres away,in only a little more than a second.

假设你在读一本书.同时,假设你突然闭上了眼睛.那么你还能看见那本书吗?当然你会说“台看不见”.但是你知道为什么吗.也许你会说我的视线无法触及到那本书.但是这个理解是错误的.你看不见任何东西除非那样东西反射的光进入了你的眼睛.你所看见的有些东西它自身就发出一些光亮.比如太阳,星星,台灯这些东西能被看见都是因为它们自身的光亮.这些东西都是发光的.但是大多数你所能看见的东西自身都不能发光.它们仅仅是反射了太阳或者其他一些能发光的物体所发出的光.比如说月亮,它自己不能发光.它是不能发光的物体.你能看见他是因为太阳光的反射,并进入我们的视线.所以月光只是次级的太阳光.
当你看一本书的时候,他会反射一些光到你的视线,然后你就能看见他了.如果你的周围没有亮光,那也就没有光可以被反射,那样即使你睁大眼睛也看不见书.
光速很快,当它反射时经由书本到达你的眼睛速度快的仿佛根本不需要时间一样.我们所看到的月光距离我们有380000千米远,只不过需要一秒多一点而已.