《资治通鉴·唐纪·唐纪二十一》
王孝杰长期在吐蕃，知道他们的情况。
孝杰久在吐蕃，知其虚实。
Wang Xiaojie had been in Tubo for a long time and knew their situation very well.
<s>[INST] Explain the meaning of this Classical Chinese passage in English: 孝杰久在吐蕃，知其虚实。 [/INST] Wang Xiaojie had been in Tubo for a long time and knew their situation very well.</s>
Explain the meaning of this Classical Chinese passage in English: 孝杰久在吐蕃，知其虚实。
user
Wang Xiaojie had been in Tubo for a long time and knew their situation very well.
assistant