人口疏密程度 population density

进口疏水阀 Hydrophobic valve ; Import trap valve

疏水阀、进口疏水阀 NEEINN

人口疏散 population evacuation

疏散出口 Evacuation Exit ; transfer exit ; emergency exit

出口疏散距离 exit travel distance

人口稀疏 sparsely populated

舱式疏散口 hatch escape