which, to his great surprise, played back the short message he recorded, "Mary had a little lamb."The word phonograph was the trade name for Edison's device, which played cylinders rather than discs. The
the forward direction is the source of what's known: what's seen by the eyes, what's happened in the past. Behind, where they can't see, lies the future.这是一个英文科学的新闻，
倒数第一丑
