For now, NASA wants to keep them shuttered most of the time to protect the fusedsilicaglass from orbital debris.
根据美国宇航局的要求，为了保护这些石英玻璃窗不被轨道碎片击碎，它们大部分时间应该处于关闭状态。
2
A high purity silica mending material with pure fused quartz as material for glass kiln has been developed.
以高纯熔融石英为主要原料研制了一种高纯硅质玻璃窑用热补料。
3
Singlet and multielement lenses are available in a wide variety of configurations and materials, including glass, fusedsilica, sapphire, and calcium fluoride.