An example of internal information might be log files from a data center, and external information might be several crawled websites or a dataset downloaded from a data catalog.
一个内部信息的例子可能是数据中心的日志文件，外部信息可能是一些抓取的网站或从数据目录下载的数据集。
2
The external fuel tank for the space shuttleDiscovery undergoes examination in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida on December 23.
12月23日，发现号航天飞机的外燃料箱正在NASA位于佛罗里达的肯尼迪航天中心的装配大楼接受检查。
3
In the absence of any net external forces - on a system as a whole — - as we discussed last time — the center of mass will always have the same velocity.