Locus of points on a surface at which the luminance is the same, for given positions of the observer and of the source or sources in relation to the surface.

对于给定的观察者位置，和给定的光源位置或者与光源相关的发光表面来说，该表面或曲线上各点的亮度相同。

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This means that even if multiple remote sources participate in a query, only one remote source or the federated server is active at any given moment.

这意味着，即使一个查询中涉及到多个远程数据源，在任何时候只有一个远程数据源或联邦服务器是活动的。

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The source (or in this case, sources) of the input data.

输入数据的源(本例中是多个源)。

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In the era of open-source sharing, anyone can set up or edit a Wikipedia page, cite questionable sources or air unsubstantiated information, it behooves us to seek the truth and to elevate facts and not let them fall victim to the whims of an intellectually bankrupt election season where the loudest beats out the truest.

FORBES: The Death of the Fact

For example, decisions could be taken to put someone on a no-fly list or a watch list based on one credible source, instead of the previous standard of using multiple sources.

CNN: U.S. lowers threshold for inclusion on no-fly lists

This is essentially the self-employed or those with incomes from multiple sources (some of which may well have been taxed at source).

FORBES: The Laffer Curve Appears in the UK