This is basically an optional flag.
这是一个可选择的标志。
The difference is subtle: running the test without the optional flag helps you understand the total time, even in the case of a failure.
区别很微妙：在一个失败的样例中，不带可选标志运行测试可以帮您了解运行总时间。
For instance, the configure script used for Angband (a Roguelike game) has an optional flag, — enable-gtk, to tell it to build with GTK support.
例如，用于Angband(一个Roguelike游戏)的configure脚本有一个可选的标记——enable - gtk，以告诉脚本在编译时启用gtk支持。
To determine the value of any generated keys, simply specify in the statement's execute method an optional flag denoting that you are interested in the generated value.
要确定任何所产生的关键字的值，只要简单地在语句的execute方法中指定一个可选的标记，表示您有兴趣获取产生的值。
The message is optional; if the -c flag has been specified, no message is needed.
消息是可选的；如果已经指定了-c标记，则不需要任何消息。
The optional page size argument is given in units of kilobytes, and the optional mirror flag is either 1 for mirroring, or 0 for no mirroring. The syntax for the this command is as follows.
可选页面大小参数以千字节为单位给定，且可选镜像标志是1(镜像)或0(无镜像)。
Control-flag: This defines the behavior of stacking modules by specifying whether any particular module is requisite, required, optional, or sufficient.
Control -flag：这指定任何特定模块是必不可少的、必需的、可选的还是足够的，从而定义模块的行为。
The optional mirror flag is either 1 for mirroring, or 0 for no mirroring. The syntax for the this command is as follows
且可选镜像标志是1（镜像）或0（无镜像）。
The optional mirror flag is either 1 for mirroring, or 0 for no mirroring. The syntax for the this command is as follows
且可选镜像标志是1（镜像）或0（无镜像）。
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