We were given a brief demonstration of the computer's functions.
有人向我们简短演示了这种计算机的各种功能。
The police were much in evidence at today's demonstration.
在今天的示威集会上警察随处可见。
She walked me through a demonstration of the software.
她一步步地给我演示软件。
There was a strong police presence at the demonstration.
示威现场有了大批警察。
The police are preparing themselves for trouble at the demonstration.
警察正在准备防范示威时可能出现的骚乱。