[mass noun]asphalt, tarmacadam, or other black material used for surfacing roads (铺路用的)沥青,柏油碎石 [as modifier]blacktop roads. 柏油路。 ■[count noun]a road or area surfaced with such material 柏油路,柏油地面
verb
[with obj.]surface (a road or area) with such material 给(道路或地面)铺沥青 41 km had been blacktopped to date. 到那时为止已经铺了41公里柏油路。