So they had bricks for stone and asphalt for mortar.
于是他们用砖代替石头，沥青代替灰泥。
2
So much stone and asphalt with nothing going on, so many empty Windows.
这么多的石头和沥青什么事情，这么多的空窗口。
3
By adding rubber "crumbs", reclaimed from shredded tyres, to the bitumen and crushed stone used to make asphalt, engineers are designing quieter streets.