V型天窗作业
work in V traffic break time
白兴吐剥蚀天窗
Baixingtu denudation dormer
玻璃天窗和采光墙
glass skylight and lighting wall
剥蚀构造天窗
scuttle structure of ablation
垂直矩形维修天窗
vertical rectangular maintenance time window
单向隔日矩形天窗
unidirectional rectangle skylight on alternate days
地下河天窗
sinkhole of underground river