您可能需要使其他项目的符号引用可用在您的项目中。
You may want to make symbol references for another project available in your project.
链接器将所有对符号的引用进行分类，标识出它们是在哪个程序库中找到的。
The linker sorts through references to symbols, making notes about in which libraries they were found.
源代码中特定位置引用的符号。
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