You basically have three sources of input and output.

一般说来，主要存在三个输入和输出源。

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The relative width of the arrows shown in Figure 1 indicates the relative emphasis of these three sources, depending on the novelty of the system.

图1中显示的箭头的相对宽度表示这三个来源的相对重要程度，这取决于系统的新颖度。

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For example, consider a federated union query across three sources.

例如，考虑一个跨三个数据源的联邦联合查询。

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Novak said the special prosecutor already had waivers from all three of his sources - that is Mr. Rove, Mr. Harlow, and this third primary and unidentified source - to testify before the grand jury that was trying to figure out whether to indict people on this stuff.

NPR: Novak Reveals Details of CIA Identity Leak

One, Judy Miller of the New York Times, refused to talk about off-the-record sources and spent almost three months in jail before ultimately co-operating with the prosecutor.

ECONOMIST: After his toughest week, Bush comes out fighting | The

Rakhimov announced his retirement July 13 following a three-hour closed-door meeting with Russian Prime Minister Vladimir Putin, according to STRATFOR sources.

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