undertones
n．
1. 低声，细语：较低的声音，尤指在正常对话声音之下的声音。
2. 暗示，含义：隐含的意义或感情。
例句
The play does not have the political undertones of the novel.
这部戏没有小说的那种政治寓意。
《牛津词典》
Although undertones of class conflict existed beneath such hostility, the opposition was primarily geographical.
尽管阶级冲突的底蕴存在于这种敌对情绪之下，但反对派主要来自地域。
Well-dressed clients were talking in polite undertones as they ate.
衣着光鲜的顾客们边吃边斯文地低声聊着天。
