They are things that already exist.

它们是已经存在的事实。

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Note that some of these lines may already exist, but they could be commented out.

注意，其中一些行可能已经存在，但是可以把它们注释掉。

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Create the tables (if they do not already exist).

创建表(如果还不存在的话)。

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What services already exist that they can use or tweak and use?

已经存在哪些服务可供使用或在调整后进行使用？

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But they argue that elements of the optimal tax system already exist in some countries.

但他们认为在一些国家存在最优税收理论要素。

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But they argue that elements of the optimal tax system already exist in some countries.

但他们认为在一些国家存在最优税收理论要素。

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