in a low voice, quietly
他伸长了脖子，希望能听到他们低声说的话。
He craned his neck, hoping to hear what they were whispering about.
知道他低声对我说了什么吗？
Do you know what he whispered to me?
— 豹 (1963)
他伸长了脖子，希望能听到她们低声说的话。