'What d'you think?' she asked in an undertone.“你觉得怎么样？”她小声问道。

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。

The sobbing voice had an undertone of anger.啜泣声中隐隐透着愤怒。

It was a witty, racy story with surprisingly serious undertones.这是一个诙谐却寓意深刻的荤段子。