The only telltale signs are the lack of door handles or letterboxes.

唯一可能穿帮的是门上没有门把，也没有信箱。

We wouldn't have that exhibition if we hadn't collected that free material that came through people's letterboxes.

如果我们没有收集人们信箱里送来的免费资料，那个展览就不会存在了。

Wow – that all sounds deadly boring – but I imagine taking photos of letterboxes is the most boring – perhaps?

哇——那听起来都很无聊——但我想给信箱拍照是最无聊的——也许吧？

Was it… a) Collecting train numbers – that's train spotting, b) Taking photos of letterboxes, or c) Driving around roundabouts of the UK?

是… … a）收集列车车次——那是指观察并记录列车编号的行为，b）给信箱拍照，还是c）在英国的环形交叉路口开车？