B2 to speak in a louder voice so that people can hear you提高嗓门,大声点说
More examples
You'll have to speak up, I can't hear you.
Stop muttering and speak up!
You'll have to speak up a bit if you want everyone to hear you.
See also: speak out/up
👨🏻🏫 Mr. Ng 劍橋詞典 📚
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