undertone
n. 低音；浅色；小声；潜在的含意
复数 undertones
例句
"What d'you think?" she asked in an undertone.
“你觉得呢？”她低声问。
《柯林斯英汉双解大词典》
His soft words contained an undertone of warning.
他温和的话中蕴涵着警告之意。
《牛津词典》
He added in an undertone to the Queen, "Really, my dear, YOU must cross-examine the next witness."
他又低声对王后说：“真的，亲爱的，下一个证人必须你来盘问了。”
