book one unit one
第一册,第一单元
以上为机器翻译结果,长、整句建议使用 人工翻译 。
When a copy sells, the book jumps to a high rank, and then gets knocked down one unit every time any lower-ranked book sells.
FORBES: The Amazon Book Jungle
Even though they can print one book at a time, it can be expensive per unit, more expensive than hard copy printers.
FORBES: Publishing Options for Your Book
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