要构造一个屏幕保护程序，最好的方式就是为其配置一个虚拟的光驱、键盘、屏幕和鼠标，但是不需要虚拟磁盘和网络适配器。

To construct a screensaver, the best way is to configure it with a virtual CD-ROM drive, keyboard, screen, and mouse, but without any virtual disks or network adapter.

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电钢琴的键盘系统构造不好（当然也不贵），而且大多数电钢琴也缺乏足够好的音响系统去与机械钢琴直接击弦产生的音质抗衡。

The construction of their actions is not as good (not as expensive) and most electronics do not have good enough speaker systems to compete with the acoustics.

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