If the Program does not specify a version number of this License, you may choose any version ever published by the Free Software Foundation.
若本程序并未指定授权版本号码时，您可以选择任一自由软件基金会所发表的版本。
When a program is linked against a library, it has the version number it's designed for stored in it.
当一个程序链接到某个程序库时，程序中会存储一个它计划支持的版本号。
The dynamic linker can check for a matching version number. If the library has changed, the version number won't match, and the program won't be linked to the newer version of library.
如果更改程序库，那么版本号就会不匹配，程序也就不会被链接到较 新版本的程序库。
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