undertone [ˈʌndəˌtəʊn]

以下由轻松背单词网站提供

附加级

n. 低音, 浅色，底色，潜在的含义

His soft words contained an undertone of warning. 他温和的话中蕴涵着警告之意。
'I don't think she's been told yet,' he said in an undertone. “我认为还没有人告诉她呢， ”他低声说道。