It's one thing to have your iPad as a secondary display, but to have touchscreen functionality to grab that Apple Pencil, press Safari and see it work.

把 iPad 作为辅助显示器是一回事，能它的使用触屏功能，和苹果触控笔功能，并能打开 Safari 又是另一回事了。

So what it is is this tiny little compact adapter that was initially supposed to be plugged into your MacBook Pro or your iMac and then use your iPad as a secondary display.

这个小巧的适配器最初被用于插入 MacBook Pro 或 iMac，然后把 iPad 用作辅助显示器。