1N-COUNT 示威;示威游行（或集会） A demo is a demonstration by a group of people to show their opposition to something or their support for something. 示威;示威游行（或集会） [British, informal]
...an anti-racist demo.
反种族主义示威
2N-COUNT [oft NOUN n]试样唱片;录音样带 A demo is a CD or tape with a sample of someone's music recorded on it. 试样唱片;录音样带 [informal]
He listened to one of my demo tapes.
他听了我的一盘录音样带。
Send us a demo with one or two of your best songs.