How do the back crawl swimmers see where they are going?

仰泳的选手如何知道他们前进的方向呢？

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The webmasters tool allows you to check crawl issues, back links, outbound links and also sitemap.

网站管理工具允许你检查抓取的内容，反向链接，出站链接，也可以是站点地图。

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America's GDP growth slowed to a crawl over the summer as builders cut back.

随着建筑商数量的减少，夏天里美国的GDP增长也慢的像蜗牛爬。

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Watson was able to crawl back to the armory.

VOA: special.2009.06.25

Just when it seemed they might crawl back, Curry countered one devastating swish after another to put a major dent in Denver's playoff hopes.

NPR: Curry Leads Warriors Past Denver 115-101 In Game 4

When we finally did crawl back out of poverty, we were staunch progressives with an appreciation for the safety net the government had provided.

FORBES: Why Is the U.S. Middle Class Unable to Defend Its Interests?

So put away your pipe, lock yourself away in a small room with some tinned soup and water, and try to crawl back into reality A.S.A.P.

FORBES: Amy Winehouse and the War on Drugs