随即，另一种搜索网站诞生了，它具有选择性提供新闻及评论的功能。
So another kind of aggregator has emerged, which offers a selection of news and commentary.
环境并不具备推动或拉动的作用；它具有选择的作用，而这一作用很难发现也很难对其进行分析。
It does not push or pull, it selects, and this function is difficult to discover and analyze.
它具有很多内置的比较算法，并且能够基于文档内容和大小自动地选择算法。
It has many built-in comparing algorithms and has the ability to automatically choose algorithms based on the document content and size.
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