这是一座居民接，虽说它年纪不大但也不算小了，说来也算不上什么旧楼。在楼上的居民看来，这座楼唯独有一缺点──楼道太窄。的确，这座楼的楼道只能容两个入并行，搬个东西什么的极为不便。这一天楼上小李正在楼道上修他家的液化气罐，因为他不时的闻到家里有点液化气味，可? This is a resident, although it is not too young but not too small. It seems the upstairs residents, this building alone has a drawback - the corridor is too narrow. Indeed, the corridor of this building can only accommodate two into the parallel, moving something very inconvenient. On the day, Li was upstairs to repair his home liquefied gas tank, because he occasionally smelled liquefied at home a bit, can?