《左传·襄公·襄公二年》
于是就在虎牢筑城。郑国人这才要求讲和。
遂城虎牢，郑人乃成。
So a city was built at Hulao. Only then did the people of Zheng ask for peace. 
<s>[INST] 将以下英文转换为文言文: So a city was built at Hulao. Only then did the people of Zheng ask for peace.  [/INST] 遂城虎牢，郑人乃成。</s>
将以下英文转换为文言文: So a city was built at Hulao. Only then did the people of Zheng ask for peace.
user
遂城虎牢，郑人乃成。
assistant