看到搜索引擎蜘蛛在没有Sitemap的情况下爬行到新页面后的时间后，我一度以为这个网站的结构有问题，导致搜索引擎蜘蛛不能爬到新页面。
After seeing how long it took the bot to crawl without a Sitemap, I figured there was a problem with the structure of the website and the bots couldn't crawl to the new pages.
这种断裂结构一度让天文学家们感到迷惑不解，直到2004年卡西尼号飞越这颗卫星时拍下了一系列的照片，天文学家才发现原来这些结构是地质活动生成的巨大悬崖。
The fractures puzzled astronomers until Cassini flew by in 2004 and revealed that they are large cliffs created by tectonic activity.
它曾一度是一个非常古老的结构。
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