So, to be 'gobsmacked' is to be struck dumb as if by a smack in the face.

一个人变得“gobsmacked”是说这个人像是被打了一个大耳瓜子，蒙了。

A society that apparently could not see the difference between the correct anchor bolt for a concrete wall and a smack in the face.

没人分得清普通混凝土膨胀螺栓和当头一棒之间的区别。