One way PERMANENT links only. No link exchanges.
我要的是一个永久的链接方式，而不是交换链接。
Only the necessary copies or links will be made.
仅产生必需的副本或链接。
Users can decide which documents they want to read, then click only those links.
用户可以决定要阅读哪些文件，然后只需单击相应的链接。
Note: this relates to trial product only, not direct buy links.
注：这只针对试用产品，与直接购买链接无关。
Or only First, part of the navigation links to the absolute page address can be?
还是只将首页，栏目页的导航链接改为绝对地址即可？
Or only First, part of the navigation links to the absolute page address can be?
还是只将首页，栏目页的导航链接改为绝对地址即可？
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