Anything on radar that looks very small ? Lifeboat , periscope , anything ?
在雷达上侦测到任何小东西吗？像是救生艇或潜望镜吗？
Partly a discovery center , the facility offers hands-on opportunities to help blow glass in front of three piping hot furnaces and look at neat uses for glass : a prism and a periscope that pops through the ceiling .
