通过更改正在搜索的字符串，使其他图像块可以得到处理，比如卫星图和地形图。
By changing this string that is searched for, other image tiles - such as satellite and terrain - can be processed.
甚至这还不够，因为XSL能够轻易地将字符串连接起来，因此表示图像的最终字符串可能位于多个位置。
Even that can be incomplete since XSL can easily append strings together, so the final string representing the image may not be found in one piece.
要扩展该 Web crawler，可以考虑收集图像引用或搜索特定的文本字符串。
To expand the Web crawler, consider collecting image references or searching for specific text strings.
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