in an undertone編輯正在努力提供更完整的內容，建議 20 分鐘後再回來看看in an undertonein an undertone — 副詞副詞1. in a quiet or soft voice, not loud1.副詞釋義低聲地in a quiet or soft voice, not loud例句She spoke in an undertone so as not to wake the baby.