Out-of-band

（重定向自Out of band）

Out-of-band is activity outside a defined telecommunications frequency band, or, metaphorically, outside some other kind of activity.

单词	Out of band
释义	Out of band 英语百科 Out-of-band （重定向自Out of band） Out-of-band is activity outside a defined telecommunications frequency band, or, metaphorically, outside some other kind of activity.
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