从一列项目字符串中创建一列PPListElement对象并且将新的依赖关系与项目中已经存在的合并在一起。

GetProjectDependencies: Creates a list of PPListElement objects out of a list of project strings and merges the new dependencies with the one that were already in the project.

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产生一个字符表达式组成的新的列。

Creates a resultant column that is a character expression.

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