Deevelopment of the Whole Metal Ultrahigh Vacuum Gat Valve with 150mm in Diameter and 1ts Experiment Applied to the Large Astronomical Electrographic Camera是什麼意思_Deevelopment of the Whole Metal Ultrahigh Vacuum Gat Valve with 150mm in Diameter and 1ts Experiment Applied to the Large Astronomical Electrographic Camera在線翻譯_英語_讀音_用法_例句