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》

To anyone who manages to figure out how these compounds are made and is contemplating trying to make one of them, a few words of warning

任何人如果想知道这些化合物如何制备并试图谋划制备其任何一种，有几句告诫的话奉送

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For many students, they seem to serve no other purpose than just provide a few words of inspiration or warning.

对很多学生来说，这些故事好像并没有什么目的，只是为他们提供了一些灵感和忠告而已。

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Former home secretary Alan Johnson had some words of warning for Mrs May, which he said were based on his own experience.

BBC: Labour slams Qatada 'farce'

In a talk at Columbia University's sociology department, renowned social scientist Donald MacKenzie gave some words of warning and advice about the financial markets.

FORBES: Magazine Article

Writing at Gameranx, Ian Miles Cheong points to a number of the other obvious flaws in the hoax letter, but sounds off with some words of warning.

FORBES: What The 'Halo 4' PR Hoax Letter Says About Gamers And Video Game Journalists