When this happens to you, you've officially reached a "hard hat" area.

当这发生在你的身上，你正式地进入了一个“安全帽”区域。

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It's not a hard hat area for nothing.

BBC: World's railway future born in Edinburgh test lab

Since January, 1871 has hosted groups of around 100 people for "hard hat" tours of the area under renovation about once a week, according to Matt Moog, chair of the project to launch 1871.

WSJ: A Start-Up Ecosystem Forms in Chicago