《新五代史·附录·四夷附录第三》
他们的君长、部族名称，不能考见，只有曾和中原有过交往的人可以考见。
其君长、部族名字，不可究见，惟其尝通于中国者可见云。
The names of their chiefs and tribes are not available, only those who have交往 with the Central Plains can be examined.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 其君长、部族名字，不可究见，惟其尝通于中国者可见云。 [/INST] The names of their chiefs and tribes are not available, only those who have交往 with the Central Plains can be examined.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 其君长、部族名字，不可究见，惟其尝通于中国者可见云。
user
The names of their chiefs and tribes are not available, only those who have交往 with the Central Plains can be examined.
assistant