To see how this influences trade, consider the business of making disk drives for computers.
"想知道这如何影响贸易，可以考虑为电脑制作磁盘驱动器的业务。
For most computers, this place is the hard disk drive, but files can exist on all sorts of media: flash drives, CD and DVD discs, or even tape backup systems.
大部分来说计算机，这一个地方是硬盘磁碟机，但是文件能在所有的媒体上存在：闪现驾驶、激光唱碟和数字化视频光圆盘，否则甚至以带子绑起预备的系统。
For most computers, this place is the hard disk drive, but files can exist on all sorts of media: flash drives, CD and DVD discs, or even tape backup systems.
大部分来说计算机，这一个地方是硬盘磁碟机，但是文件能在所有的媒体上存在：闪现驾驶、激光唱碟和数字化视频光圆盘，否则甚至以带子绑起预备的系统。
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