This means that every row in the point table must have a key value (consisting, in this case, of two column values) that must also exist in the source table.

这意味着点表中每一行的键值（在这个示例中，由两个列值组成）必须也在源表中存在。

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The token represents a relative point in the modification sequence of a row.

这个标记表示某一行的修改序列中的一个相对点。

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Basically, the purpose of this indexer is to return a point corresponding to a given row and column on the drawing surface. Follow these steps.

本质上，该索引器的目的是返回一个与绘制面上已知的行和列相对应的点。

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The one eye was fixed at a point over past the row of vinyl screens.

NEWYORKER: Wiggle Room

The Knicks were finally able to ice it out for good when superstar Carmelo Anthony (21 points), who'd missed his last 18 three-point attempts in a row, connected on a triple that gave the Knicks an 84-75 edge with just under two minutes remaining.

WSJ: Knicks Win Ugly to Capture Series

He missed five in a row at one point, including an airball that might've been 2 feet short.

WSJ: Williams hits 11 3s, scores 42 as Nets top Wizards