In the center of each gallery is a ventilation shaft, bounded by a low railing.
在每一条廊道中心都有一口通风井，外面围着一道矮矮的栏杆。
2
There is not a single pane of glass anywhere around the site, and the only mechanical ventilation installed is in the gallery.
基地内的任何地方都没有单一的玻璃窗格，而且唯一的机械通风设备安装在了画廊中。
3
An introduction is given to jet flow galleryventilation technology and its application to Bantao Tunnel. This technology is a breakthrough compared with conventional galleryventilation technology.