1. The spider is one of the most well-known crawlers in the animal kingdom.
这种蜘蛛是动物界中最有名的爬行动物之一。
2. Web crawlers are widely used by search engines to index and search for information on the internet.
网络爬虫被搜索引擎广泛使用，用于在互联网上进行信息索引和搜索。