C was the first programming language that made portability a reality for system-level code.
C语言是第一个使得系统级代码移植成为可能的编程语言。
If you check out only the top-level code file, your changes might be lost.
如果只签出顶层的代码文件，您的更改可能会丢失。
However, at the logical level, code is not aware of physical level types.
然而在逻辑层，代码并不知道物理层类型。
However, at the logical level, code is not aware of physical level types.
然而在逻辑层，代码并不知道物理层类型。
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