如果没有，或者网页快照是两个月以前的，删掉。
If do not have, or webpage snapshot is two months previously, expunge.
文章介绍了搜索引擎网页快照系统的实现以及在安全性能方面的研究。
The article introduces the realization and Safety performance of search engine website snapshot system.
现在很多搜索词下面都会列出很多相关搜索，并且较长搜索词的网页快照也越来越长。
A greater number of related queries will now be listed for many searches and longer page excerpts (" snippets ") will be shown in response to longer search queries.
在对搜索引擎相关技术进行了阐述之后，对搜索引擎中网页快照技术进行了研究。
After expatiating on the related technology of search engines, it put forward the research of search engine website snapshot.
在对搜索引擎相关技术进行了阐述之后，对搜索引擎中网页快照技术进行了研究。
After expatiating on the related technology of search engines, it put forward the research of search engine website snapshot.
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