The duo performance took place in the big showroom. Before starting, Green told the sound booth technician to turn the speaker volume way down.

他们当时在大演播厅里表演合奏，开演前格林告诉音响室里的技师将扬声器声音调低。

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To increase speaker volume, press the top volume button repeatedly until you reach the desired volume level.

增大听筒音量，请重复按上部音量控制键，直到达到理想音量。

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The speaker volume is not turned up or is muted.

扬声器音量没打开或静音。

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This clean arrangement was a smart move on Samsung's part, one that should save consumers the confusion of fumbling around simply to raise or lower the speaker volume.

ENGADGET: Samsung Galaxy Note 8.0 review

England claimed third umpire Harper had failed to turn up the speaker volume when they referred the decision and said they were seeking to have the lost referral reinstated.

BBC: ECB's Giles Clarke says referral system is 'a shambles'

However, England allege that Harper did not have the speaker volume on the stump microphone turned up high enough and so was unable to hear the ball hitting Smith's bat.

BBC: ICC to investigate referral complaint made by ECB