空白的括号对代表空的列表。

An empty list evaluates to an empty list.

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缺省情况下，将返回一个空的列表，这表明没有子对象。

By default, an empty list would have been returned, which indicates no children.

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也就是说，你可以传入任意多的，以分号分隔的字符串（包括空的列表）。

That is, you can pass in as many comma-separated strings as you want (including an empty list).

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