External tables provide a normal table interface to data files that reside in the underlying operating system.
外部表对驻留在底层操作系统中的数据文件提供一个普通的表界面。
Multiple devices can be connected in series through an interface that sends data up and down the battery stack without external level shifters or isolators.
多个器件可以通过一个接口串联连接，该接口无需外部电平移位器或隔离器，就可沿着电池组来回发送数据。
Informix provides access to external data sources through the virtual table interface (VTI).
Informix通过虚拟表接口(VTI)提供对外部数据源的访问。
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