吁[xū] 基本解释：
新英汉大词典：
- 吁[xū]
- 动词- （叹气） sigh:
sighs and groans; moan and groan长吁短叹
- 感叹词- （表示惊异） why; oh:
My, what kind of talk is this?吁! 是何言欤!
以上内容来源于：《新汉英大辞典》
例句与用法：
Before he reaches the top, he is already sweating and panting.
吁的其他解释:
Before he reaches the top, he is already sweating and panting.