The preprocessor variable defined to prevent a header from being included more than once in a single source file.

为防止头文件被同一源文件多次包含而定义的预处理器变量。

youdao

Accordingly, it is important to design header files so that they can be included more than once in a single source file.

因此，设计头文件时，应使其可以多次包含在同一源文件中，这一点很重要。

youdao

When I started to analyze the process, I determined that I can automate items such as version Numbers and file names by defining them in a single source.

分析了该过程之后，我决定将诸如版本号、文件名等内容定义到单一源中，以此来实现这些内容的生成自动化。

youdao

"In some of the governorates, have not a single member working, without any source of income, which is in turn having a huge impact on their ability to afford rented accommodation and their ability to buy food in a country where the public distribution system is failing quite badly,".

VOA: standard.2009.09.20

Bittorrent -- Bram Cohen debuted Bittorrent, a method of downloading files that pieced them together from many users' computers instead of pulling them from a single source, in 2002.

FORBES: Magazine Article

They are mined from a single source, the Argyle Mine in Western Australia.

FORBES: The $1 Million Pink 'Prosperity' Diamond

"However, the JIC was prepared to rely on a single source because the official was a senior figure in Mr Hussein's regime, not a defector, " the paper said.

CNN: Report: UK's WMD source top Iraqi