动词
中文翻译：发出低沉的哼声
同义词：
['grunt', 'huff', 'growl']
例句：
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1. He grunted in agreement as he nodded his head.
他点头表示同意时发出了低沉的哼声。
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2. The dog grunted at the stranger as they approached.
当陌生人走近时，狗发出了低沉的哼声。
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3. The farmer grunted as he lifted the heavy load of wood.
农民在提起沉重的木头时发出了低沉的哼声。