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他长叹一声；一声很长很长很长的叹息。
He heaved a deep sigh; a long, long, long sigh.
youdao
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他缓缓长叹一声，声音里既有惊讶，又有同情。
He drew his exclamation out slowly, and the way he did it meant both wonder and sympathy.
youdao
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他也把脑袋搁到臂弯里，长叹一声，睡着了。
And he too put his head on his arms, gave a deep sigh, and fell asleep.
youdao