1. （狼、狗等）长嚎，嗥叫
    If an animal such as a wolf or a dog howls, it makes a long, loud, crying sound.

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    e.g. Somewhere in the streets beyond a dog suddenly howled, baying at the moon.
           远处的街上，有只狗突然对月长嚎起来。

2. （人因疼痛、愤怒、愁苦而）吼叫，嚎哭，哀号
    If a person howls, they make a long, loud cry expressing pain, anger, or unhappiness.

    e.g. He howled like a wounded animal as blood spurted from the gash...
           当血从伤口中喷出时，他像一只受伤的动物一样嚎叫起来。
    e.g. The baby was howling for her 3am feed.
           宝宝哀号着要吃凌晨3点的那顿奶。

3. （风）呼啸，怒号
    When the wind howls, it blows hard and makes a loud noise.

howl的解释

    e.g. The wind howled all night, but I slept a little...
           风整夜怒号着，但我还是睡了一会儿。
    e.g. It sank in a howling gale.
           它在呼啸的狂风中沉没了。

4. （人）高声嚷，大声呼叫
    If you howl something, you say it in a very loud voice.

    e.g. 'Get away, get away, get away' he howled...
           “滚开，滚开，都滚开”他高声嚷道。
    e.g. The crowd howled its approval.
           人群高声欢呼，以示赞同。

5. 放声（大笑）
    If you howl with laughter, you laugh very loudly.

    e.g. Joe, Pink, and Booker howled with delight...
           乔、平克和布克高兴得放声大笑。
    e.g. The crowd howled, delirious.
           人群笑声震天，欣喜若狂。

相关词组：howl down