It's just that each of these mediums is limited by the nature of the product itself, so none of them really give people the right feeling for reading. It was only when the Sony Reader and Amazon Kindle, made specifically for book-lovers, came onto the market that the future outlook for e-books began to take more definite shape.
只是它們各自受限於原本用途，很難讓人讀起來稱心如意，直到專為愛書者量身打造的 Sony Reader 和 Amazon Kindle 問世後，電子書的前景才逐漸確立。