Check that the remote FTP port is not blocked.

确认远程FTP端口没有阻塞。

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Another place to check if a page has been blocked is within the page's HTML source code itself.

另一个检查网页是否已经被拦截的地方就是在网页源代码本身。

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The researchers then staged an “incident” in which the camp’s water supply was cut off and all the boys had to check the water pipe (more than 1 km long) to see where it was blocked.

研究人员接下来安排了一个“事故”，他们切断了营区的供水。 所有的男孩子都要去检查水管（长度不止1公里），看看是不是有哪里堵住了。

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