“whisper、Murmur” 和 “mumble” 作动词时都可以表示 “小声地说”，它们之间的区别是什么？哪个词的意思是 “刻意压低声音，只让身边的人听见”？想要说一个人 “小声嘟囔”，应该用哪个词？
1 “Whisper” 用来表示 “因为只想让身边的人听到，所以故意小声说话”，类似于汉语里的 “说悄悄话”。
I don’t want everyone to hear! I’ll have to whisper.
I couldn’t hear what the children were whispering about.
2 “Murmur” 用来表示 “持续地低声说，低语”。
‘I love you’, she murmured in her sleep.
He was murmuring continuously.
3 “Mumble” 用来表示 “小声嘟囔”。
She’s always mumbling and complaining very quietly, so I can’t hear! It drives me mad!
I couldn’t understand what he was mumbling about.
