HSK 7-9
呼啸
hūxiào动
to whistle; to scream; to whiz
寒风整夜在窗外呼啸。
Hán fēng zhěng yè zài chuāng wài hū xiào.
The cold wind howled outside the window all night.
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Appears across levels (7-9) in the HSK 3.0 word list.