... twice e a month 每个月两次 three e times a year 每年三次 go skating / skateboarding 去滑冰/ 滑板 ...
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three e times a year
一年三次
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Just a year earlier hardbacks had been worth more than three times as much as e-books, according to the Association of American Publishers. Amazon now sells more copies of e-books than paper books.
据美国出版商协会统计，仅仅一年之前精装书的销量还是电子书的三倍，但现在亚马逊售出的电子书拷贝要多于纸质书。
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