如果说自己声音太大了这么说: Sorry, I was speaking too loudly. （不好意思，我刚才说话声音太大了）
如果说别人声音太大了这么说: Excuse me, can lower down your voice？（不好意思，你能小声一点吗）
Excuse me,you speak too loudly
Excuse me,you speak too loudly （望采纳）
Excuse me, this is too loudly.
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