《北史·列传·卷八十二》
公孙度称雄海东时，伯固和他往来友好。
公孙度之雄海东也，伯固与之通好。
When Gongsun Du was dominating over the east of the sea, Bu Gu maintained a good relationship with him.
<s>[INST] Transpose the following Modern Chinese text into Classical Chinese: 公孙度称雄海东时，伯固和他往来友好。 [/INST] 公孙度之雄海东也，伯固与之通好。</s>
Transpose the following Modern Chinese text into Classical Chinese: 公孙度称雄海东时，伯固和他往来友好。
user
公孙度之雄海东也，伯固与之通好。
assistant