《资治通鉴·唐纪·唐纪二十九》
不久，苏禄听说杜暹当了宰相，才逐渐地将军队撤走，随即又派使者向唐朝进献贡品。
既而苏禄闻暹入相，稍引退，寻遣使入贡。
Soon, Su Lu heard that Du Xian had become the prime minister, so he gradually withdrew his troops and immediately sent an envoy to pay tribute to the Tang Dynasty.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 既而苏禄闻暹入相，稍引退，寻遣使入贡。 [/INST] Soon, Su Lu heard that Du Xian had become the prime minister, so he gradually withdrew his troops and immediately sent an envoy to pay tribute to the Tang Dynasty.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 既而苏禄闻暹入相，稍引退，寻遣使入贡。
user
Soon, Su Lu heard that Du Xian had become the prime minister, so he gradually withdrew his troops and immediately sent an envoy to pay tribute to the Tang Dynasty.
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