动词短语
中文翻译：叹息
同义词：
['mutter', 'sigh', 'moan']
例句：
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1.She sighed out loud when she heard the bad news.
她听到那个坏消息时，忍不住叹了口气。
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2. He muttered under his breath as he walked past the old tree.
他默默地走过那棵老树时低声嘀咕。
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3. The old man moaned softly as he sat by the window.
老人轻轻地呻吟着坐在窗边。