The metadata is used by the feed generator to access the data sources and to invoke the transformation engine when data is aggregated or transformed from one or more of the sources.

feed 生成器使用该元数据访问数据源，并在聚合或转换来自一个或多个数据源的数据时调用转换引擎。

youdao

A generator may generate electricity when (it is) driven by a steam engine, gas engine, or water wheel.

当发电机由蒸气机，燃气轮机或水轮机驱动时，它便能发电。

youdao

Air filter for small engine, such as mower, chainsaw, generator and other garden machines or power tools.

空气过滤器的小型引擎，如割草机，油锯，发电机和其他园林机械或电动工具。

youdao