B2 to breathe out slowly and noisily, expressing tiredness, sadness, pleasure, etc.叹息,叹气
If the wind sighs, it makes a long, soft sound as it moves through trees.(风穿过树林时)发出呜咽声
More examples
He sighed heavily and returned to his book.
'I'll never understand these instructions,' he sighed.
When I suggested a walk, she simply sighed.
He sighed in despair as he read the letter.
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