The microphone was making a strange whistling sound.

扩音器发出一种奇怪的哨音。

《牛津词典》

A whistling sound commenced then nothing.

甲呼啸声开始然后一无所有。

youdao

Sneakoscope - A device which looks something like a gyroscope and which gives off a whistling sound when someone untrustworthy is around.

当周围有不可信任的人时，它就会发出像口哨一样的声音。

youdao

When his mother listened to his chest she could hear that squeaky whistling sound known as wheezing.

VOA: special.2009.07.28

They may also make a whistling or squeaky sound, called wheezing, when they breathe.

VOA: special.2009.07.28

David's book opens by evoking the gruesome whistling sound emitted by sheep's lungs frying in oil.

ECONOMIST: What cookbooks really teach us

Clean, silent, (well, OK, a high-pitched whistling sound), uses no fuel whatsoever, except hydrogen, the most plentiful element on the planet, and emits only water vapor.

FORBES: Disappointed With Electric Cars, Automakers Are Making Bad Bet On Fuel Cells

The whistled language replaces each vowel or consonant with a whistling sound: two distinct whistles replace the five Spanish vowels, and there are four whistles for consonants.

UNESCO: Culture