2019年6月英语四级翻译：电子书

　　请将下面这段话翻译成英文：

电子书(e-book)通常指数字化出版物，它可以包含文字、图片、声音、影像或几者兼有。现在人们经常使用智能手机(smartphone)、平板电脑(tablet)或者专门为电子书制造的电子阅读器来阅读电子书。电子书内容丰富，便于存储，而且价格低廉，有助于阅读的普及。从传统意义上讲，电子书是纸质书的电子化，但现在许多电子书并没有纸质的对应物。电子书以数字形式存储，因此人们随时都可以阅读。2012年，美国电子书的销量首次超过精装书(hardcover book)。

　　参考译文：

E-books generally refer to digitized publications. They can include words, pictures, sounds, images, or a combination of two or more. Now people often read e-books with smartphones, tablets, or e-books readers that are specially made for e-books. E-books have colorful contents and are convenient to store. Their prices are cheap and they are conductive to the popularity of reading. E-books are traditionally believed as an electronic version of the printed books. but now many e-books exist without any printed equivalent. E-books are stored digitally, so they can be read at any time. In 2012,e-books sales in the United States surpassed hardcover book sales for the first time.

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