visa application

You are required to submit the following documents, including:
1. Passport;
2. Application form & photo;
3. Verification Letter of Invitation and an invitation which is issued by a Chinese citizen or organization, or an Invitation Letter TE (printout or photocopy), Invitation Letter from a Chinese business partner and Employment/Service Certificate;
4. Flight reservation document
5. Hotel reservation document
6. Your bank statement
7. Other materials considered necessary by the Embassy or consulate-General of P.R. China.

Thank you for your response.
However, i would like to know the other materials considered necessary by the Chinese embassy and what is meant by letter of invitation ''TE'' as stated in your response.