《资治通鉴·后周纪·后周纪四》
派遣后部郎中陈处尧携带厚礼渡海到契丹乞求出兵；契丹不能为南唐出兵，因而留下陈处尧不送还。
遣兵部郎中陈处尧持重币，浮海如契丹乞兵。契丹不能为之出兵，而留处尧不遣。
Sent the junior official of the Department of the Palace Rearguard, Chen Chuyau, to cross the sea and go to the Khitan to beg for military assistance; the Khitan refused to send troops for the Southern Tang, and so kept Chen Chuyau and did not send him back.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 遣兵部郎中陈处尧持重币，浮海如契丹乞兵。契丹不能为之出兵，而留处尧不遣。 [/INST] Sent the junior official of the Department of the Palace Rearguard, Chen Chuyau, to cross the sea and go to the Khitan to beg for military assistance; the Khitan refused to send troops for the Southern Tang, and so kept Chen Chuyau and did not send him back.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 遣兵部郎中陈处尧持重币，浮海如契丹乞兵。契丹不能为之出兵，而留处尧不遣。
user
Sent the junior official of the Department of the Palace Rearguard, Chen Chuyau, to cross the sea and go to the Khitan to beg for military assistance; the Khitan refused to send troops for the Southern Tang, and so kept Chen Chuyau and did not send him back.
assistant