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

There was a large flatbed truck out there and there were these people on this truck getting you-- trying to sell you audio equipment, and they had a big banner up there.

那儿有一个大平板卡车,有一群人在车上,正试图向你推销音响,他们还有个巨大的横幅

耶鲁公开课 - 聆听音乐课程节选