1、
In music theory, an octad refers to a group of eight pitches that form a complete octave.
在音乐理论中，八度组指的是由八个音高组成的完整八度。
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2、
The octad of friends gathered for a reunion, reminiscing about their shared memories from college.
八个朋友聚在一起重逢，回忆起他们在大学时的共同回忆。
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