工程师对新软件的功能进行了清晰的演示。

The engineer provided a clear ___demonstration of the new software's features.

我们在烹饪学院参加了一场烹饪演示。

We attended a cooking ___demonstration at the culinary institute.

在使用这台机器前，所有操作员都必须观看安全操作演示。

Before using the machinery, all operators must watch a safety ___demonstration.