undertone

/ˈʌndə(ɹ)təʊn/ 名词 C1

中文：低音、弦外之音、底色

An auditory tone of low pitch or volume. (countable, uncountable)
An implicit message perceived subtly alongside, but not detracting noticeably from, the explicit message conveyed in or by a book, film, speech or similar (contrast with overtone); an undercurrent. (countable, figuratively, uncountable)
A pale colour, or one seen underneath another colour. (countable, uncountable)
A low state of the physical faculties. (countable, uncountable)

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来自图书馆

“Call the next witness.” And he added in an undertone to the Queen, “Really, my dear, _you_ must cross-examine the next witness.

“_Un_important, of course, I meant,” the King hastily said, and went on to himself in an undertone,

“Thou art the master,” said Bagheera in an undertone.

Was it my imagination that there was an undertone of fear rather than of hope in the question?

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