在撰写本文时，YQL还不允许您通过公用键(一个联接)来链接表，只允许您在一个查询(一个子查询)内使用另一个查询的结果。

As of this writing, YQL doesn't allow you to link tables through common keys (a join), but only permits you to use the results of one query inside another (a subquery).

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这就Lewis给我们的礼物，Lewis结构，你能够通过公用电子，形成共价键。

So, that's his gift to us: the Lewis structure, and the idea that you could share electrons and form a covalent bond.

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请按任意键继续或按c键载入组态公用程序。

Press any key to continue or 'c' to load the configuration utility.

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