可以说lower your voice,如果想客气一点的话可用could you please speak in a lower voice so that i can hear you more clearly?
silence
do well in ... / be good at ...lower one's vioce
keep a low vioce
keep the voice low
Do a great job in... Be good at doing sth.be fantastic/ satisfying/ brilliant/ excellent/ fabulous/ extraodinary in sth. 很多词啦，反正都是做得好，令人满意的意思。Lower sb's voice, keep sb's voice down都是压低声音，低声说话的意思。
low your voice
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吃出新味来
