他们只是在微信聊天，没有邮件和电子邮件的来往，更没有合照。我朋友的儿子需要准备哪些材料证明，那个女生需要准备哪些材料证明？谢谢老师！
-The boy needs to write a letter of invitation to the girl to invite her to visit him. If the boy will pay the travel costs, then he needs to provide the completed I-134 with the support documents. The girl may provide teh copy of their communication records.
Just try and youi never know. If fail, the boy may visit China to meet the girl face to face, then the girl can try it gain later.
