I'm optimistic about the audio equipment and about our slide material and things such as that.

我对我们的音响设备,和我们的投影材料等都很有信心

耶鲁公开课 - 聆听音乐课程节选

From the freedom of information viewpoint, this indicates how the law can provide access to video or audio material held by public authorities as well as the written word.

BBC: Pandemic flu advert revealed by Department of Health

It also filed more than 1, 000 secret ones, and over six hours' worth of classified audio-visual material.

ECONOMIST: China's secret media

Observations as well as literature and audio-video material were collected where available.

CENTERFORSECURITYPOLICY: New Shariah study documents Islamist threat