By the way

来源: 于 2005-07-13 12:08:14 [旧帖] [给我悄悄话] 本文已被阅读：次

This is a wrong statement:
他出境中国得用有效的中国的旅行证，不能用美国护照

The US passport must be used to leave China in whatever situation, because passport itself is the most basic travel document in addition to a citizenship doc.