1. Smart speaker
1.1
1.2
1.3
1.4
1.5
1.6
1.7
The broken line shown in the “smart speaker” in FIG.
Double bass smart speaker.
1. Smart speaker
1.1
1.2
1.3
1.4
1.5
1.6
1.7
The broken line shown in the “smart speaker” in FIG.
Double bass smart speaker.
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