直接连通 meaning in English

direct communication

It is acceptable in certain cases ( especially when the ship is too small to have an internal hangar , and / or when the ship or station is civilian ) to have garages directly on the external hull , leading to space , with no hangar
在某些情况下（尤其当舰船太小，无法在其内部装配机库；或者舰船/空间站是民用的），可以把泊位入口直接连通面向船壳的外部空间，而不再使用机库。
Underground building with its closed , exits lacked , the people density being large , the flow direction of smoke and the spread direction of fire are consistent in the evacuation routes . fires in the underground building are much danger than over ground building . the hazards of smoke are especially strict in underground building , so smoke control in the underground building has becoming the focus
地下商业街由于其封闭性强,与地面直接连通的出入口少,内部通道的人流密度大,火势蔓延的方向和烟气流动的方向与人员疏散的方向相一致,因此一旦发生火灾将产生比地上建筑更为严重的后果,火灾时烟气危害将更为严峻,因此地下商业建筑的烟气控制研究越来越受到人们的关注。