真空管
zhen¯ kong¯ guanˇ
Vacuum pipe, Vacuum tube
真空 Vacuum
zhen¯ kong¯
真空管線
Vacuum lines, Vacuum tubing
zhen¯ kong¯ guanˇ xianˋ
真空管線系統
Vacuum tube system, Vacuum plumbing
zhen¯ kong¯ guanˇ xianˋ xiˋ tongˇ
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