1. 啸叫声：Hour 小时 | Howling 啸叫声 | Howlround 啸叫

2. 振呜：housing 外壳 | howling 振呜 | hsic 高速集成电路

3. 嚎叫：howlet 枭 | howling 嚎叫 | howsoever 不管如何

4. 啸声：howler 嗥鸣器鸣音器 | howling 啸声 | hoy 港口驳船

noun

1. a long loud emotional utterance

e.g. he gave a howl of pain
howls of laughter
their howling had no effect

Synonym: howlululation