专家谈中国总理16年来首访朝鲜：彰显发展中朝关系的战略方向

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On: October 15, 2025

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2025年10月9日上午，应朝鲜劳动党中央委员会和朝鲜民主主义人民共和国政府邀请，中共中央政治局常委、国务院总理李强率中国党政代表团乘包机离开北京，赴平壤出席朝鲜劳动党建党80周年庆祝活动并对朝鲜进行正式友好访问。中方为何会以高规格参与此次活动？李强总理此访能为中朝交流合作带来哪些积极因素？相关专家对此进行了解读。（刘世炯）

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Spider

Web crawler, sometimes called a spider or spiderbot and often shortened to crawler, is an Internet bot that systematically browses the World Wide Web and that is typically operated by search engines for the purpose of Web indexing (web spidering).

Web search engines and some other websites use Web crawling or spidering software to update their web content or indices of other sites' web content. Web crawlers copy pages for processing by a search engine, which indexes the downloaded pages so that users can search more efficiently.

Crawlers consume resources on visited systems and often visit sites unprompted. Issues of schedule, load, and "politeness" come into play when large collections of pages are accessed. Mechanisms exist for public sites not wishing to be crawled to make this known to the crawling agent. For example, including a robots.txt file can request bots to index only parts of a website, or nothing at all.

The number of Internet pages is extremely large; even the largest crawlers fall short of making a complete index. For this reason, search engines struggled to give relevant search results in the early years of the World Wide Web, before 2000. Today, relevant results are given almost instantly.

Crawlers can validate hyperlinks and HTML code. They can also be used for web scraping and data-driven programming.