heave a long sigh ; draw a deep sigh ; let out a long heavy sigh
... profound impact：极大的冲击力或影响力， a profound sigh：一声长叹， profound sorrow：极度的悲哀， ...
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讲到这里，朋友发出一声长叹！
In talking about this, uttered a deep sigh friend!
youdao
结尾是一声马嘶，听上去很像一声长叹。
It ended with a whinny that sounded very like a sigh.
他发出一声长叹。
He sighed a long sigh.
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