Simply add the Userfly code to your site, and you'll soon be a fly-on-the-wall as users walk through your pages.

只要把一行userfly代码添加到你的网站里，你很快就可以跟踪用户访问网页的数据。

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Use a fly-on-the-wall approach: Describe what happens as if you're a fly on the wall observing the events transpire.

应从旁观者的角度去描述：作为观察事件发生的旁观者描述发生了什么。

youdao

This week he appeared in a fly-on-the-wall television documentary to say that he had made up his mind as to whether to run... but would not reveal his decision until July.

本周他出现在《墙上飞翔》(fly - on - the - wall)[10]纪录片中，他说已经决定了怎么做……不过在七月之前他是不会说了。

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The fly-on-the-wall film is produced by 19 Entertainment - the company owned by the Beckhams' manager, Simon Fuller.

BBC: NEWS | Entertainment | 'Drastic cutback' on Beckham show

The show first burst on to our screens last year, proving an instant hit by combining the twin British loves of fly-on-the-wall TV and all things celebrity.

BBC: Jungle fever turns up the heat

Robert Hardman, a royal correspondent for the Daily Mail, offers a convincing tour of the British monarchy as an institution, apeing the vantage point of the fly-on-the-wall documentary.

ECONOMIST: Why the queen has to be seen to be believed