As with the interpreters, written translation should also be done in-house if at all possible. Employees are more likely to catch typos because they know what the materials should say. If this is not possible, submission of materials to the translation team early will net better results than a last minute attempt. Chinese speakers often read their speeches. Although not so interesting to listen to for an American, the advantage of reading a script is that the interpreter has had an opportunity to go over each element in advance.
Interpretation is therefore more likely to be accurate than with a more flowing presentation.
If you feel too uncomfortable traveling thousands of miles to simply read your speech, and you are depending on the interpreters supplied by the program, there are ways to increase the level of accuracy of your presentation to the point that your materials are fully understood. First, practice your enunciation. The more clearly you can speak, the better the interpreter will understand and be able to pass your information on as intended. Second, speak slowly. Watch a political leader, like a Senator or the President give a speech.