If the traction and sliding friction in the direction perpendicular to the direction, then the sliding friction is independent of the size and traction, if not vertical, then there is traction in the direction of the friction part, and thus impact. Automobile brake, only by the friction, therefore no effect.
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However, tags can be hard to parse visually, especially if the XML producer does not arrange vertical and horizontal whitespace to make it easier.
但是,标记很难可视地进行解析,特别是在XML编写者没有为便于解析而排列垂直和水平空白的情况下。
This is the same problem that I believe many new vertical search engines suffer from - there is not enough incentive for users to tell their friends about the service, even if it is a great product.
其实对于很多垂直搜索引擎来说,都面临着同样一个问题:无法给用户激情让其将这个服务告诉别人,即便这些服务已经十分完美。
Clearly even Google itself recognizes the utility of having specialized, focused search - if not for every vertical, at least for some like Blogs and Music.
很明显Google自己也认识到了专门化搜索的实用性,即使没有进入每一个垂直领域,至少专注于类似博客和音乐这类方面。
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