evacuationn.撤离；疏散n.排泄；排泄物evacuation point[伤病员、装备]撤运点,后送点evacuation steps后撤步evacuation slide紧急出口evacuation means后送工具evacuation works挖掘工程evacuation marks指向疏散标志evacuation order撤离命令; 撤离令evacuation drill疏散演习evacuation model疏散模型evacuation crowd疏散人数