No statistics are available on the sales of this sliver of the book market.
这本书只是书海中的一粟，销量并不可知。
The important point is the packaging sales, must be the existence of propaganda, no matter how good the book if not propaganda, not well known, it will only put together a bunch of text.
重要的一点是包装销售，一定要有宣传工具的存在，再好的书如果不宣传，不广为人知，只会是一堆拼凑的文字。
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