China VP Xi Jinping’s speech at D.C.:
Speech begins at 26:40
This interpreter had an English script she’s reading from, explaining her smooth delivery, however, even if there wasn’t a script she would still have to interpret. Or if the script was in Chinese only and she had no time before the speech to look it over, she’d have to do sight translation as she interpreted, also a very challenging task.
She was excellent at matching her speed to the speaker, slowing down or speeding up as the speech was delivered.
Journal of a Chinese-English Translator 