because your mind is already in that mode of bringing ideas from concept to something a little bit more concrete.

因为你的大脑已经处在能把概念转化为比较具体的实物的模式中了。

英语写作：技巧 - SpeakingMax英语口语达人

Everyone has done so many laps round this circuit and it's not particularly inspiring as it is a bit of a concrete jungle.

BBC: Steve Parrish's MotoGP column

To save pounding the concrete there hop in a taxi -- standard cabs are white, but for the sake of a bit more legroom, shinier leather seats, and twice the cost, black deluxe taxis are also cruising the streets.

CNN: Look into your Seoul for a hit of Korean flavor