不熟悉的设备

　　A: I haven't seen this machine before. What's it used for?

　　A:我以前从来没有见过这个机器。它做什么用的？

　　B:It's a really useful piece of equipment. It's for smoothing rough edges. Here let me show you how it works. It's very simple to operate.

　　B:这是设备上一个很有用的零件。它是用来修整毛边的。让我给你演示一下它是如何工作的。很容易操作的。