He had the tracks spaced far enough apart that columns could be installed to support a deck.

所以，他在铁轨之间留出了足够安装柱子支撑起一个平台的空间。

Government and private sector organizations are working to track space junk and potential solutions are popping up on college campuses too.

政府和私人组织正在设法追踪太空垃圾，大学中也产生了各种清理方案。

They're currently building what they call a " space fence" , which is just a radar-based space surveillance system that will allow the Air Force to better track space debris and artificial satellites.

他们目前正在建造所谓的“太空围栏”，这是一个基于雷达的太空监视系统， 可以让空军更好地跟踪太空碎片和人造卫星。