坑道空气
坑道空气
一到那儿,他便手抓扶手一直走到底下的台阶时才放开手,那里通道的空气暖和些,地面上结冰。
Abstract To survey the purifying effect of the tunnel air purification device on typical volatilie organic substances.目的观察研制的坑道空气净化装置对多种挥发性有机物的净化效果。
Once there, he would cling to the handrail until reaching the lower steps that the warmer tunnel air kept free of ice.一旦出现,他会直到达到下的台阶,温暖的隧道空气保持无冰抱扶手。