D라이브러리

ships, for those in charge of the world's radio and television com-munication and so on.Eventally, in the distant future we will have to add a leap-second every single day, at which point we'll just to agree that the day has become a second longer. We can then define the second as a very tiny bit longer than it is now so as to keep the same number of seconds per day.But meanwhile, a leap ...

in the book itself. The essential idea of a book hasn't changed in five millennia and won't change in the foreseeable future. Nothing can substitute for the written word in some portable, more of less permanent form, that can be transferred from hand to hand. You may have heard it said that "A picture is worth a thousand words," but don't you believe it. It may be true on occasion - for ...

되므로, 그것은 평화를 향한 강력한 유인이 될 것이다.We're going to need energy for the indefinite future and Soviet scientists are making plans with this in mind. They are now proceeding with a project to place huge solar power stations in space that would beam electricity to Earth. Although the project has potential military application, it also offers an excellent ...