《左传·成公·成公十一年》
晋国人认为成公倾向楚国，所以扣留了他。
晋人以公为贰于楚，故止公。
People in the State of Jin believed that Duke Cheng favored the State of Chu, so they detained him.
<s>[INST] Kindly elucidate the central themes in this passage in English: 晋人以公为贰于楚，故止公。 [/INST] People in the State of Jin believed that Duke Cheng favored the State of Chu, so they detained him.</s>
Kindly elucidate the central themes in this passage in English: 晋人以公为贰于楚，故止公。
user
People in the State of Jin believed that Duke Cheng favored the State of Chu, so they detained him.
assistant