Size:high back, medium back, low back, cantilever.
规格：高背，中背，弯管。
You can back up to whatever medium is most convenient.
备份到任何一种存储介质，这是最方便的。
Obvious choices are to back up the files to a traditional medium, such as tape.
显而易见的选择是将文件备份到传统媒介，如磁带。
During a seance the medium was offering to bring people back from the other world.
在降神会期间里，灵媒表演把人们从其他的世界带回。
The wave continues to grow as it sweeps back and forth across the active medium.
光波在激活媒质中来回穿过时，将不断得到加强。
The wave continues to grow as it sweeps back and forth across the active medium.
光波在激活媒质中来回穿过时，将不断得到加强。
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