此函式用在设定变数的预设值，如果变数的值是空白或尚未设定的话，则会列印出预设值，使用此函式时会预设需要一个参数。
This is used to set a default value for a variable. If the variable is empty or unset, the given default value is printed instead. Default takes one argument.
本公司专业软体，可完成所有试验的参数设定、工作状态控制、资料获取和处理分析、结果显示和列印输出。
Special software can finish all testing reference setting, controlling of working status and collecting data & analysis, results shown and printing output;
接下来你会看到很多的讯息，这些讯息列印了很多的状态讯息，这些讯息是不同的Moodle模组所需要的资料表设定的讯息，跟之前的一样，这些讯息应该是绿色的 。
Next you will see more pages that print lots of status messages as they set up all the tables required by the various Moodle module. As before, they should all be green.
章节 n的边界设定已超出纸张的可列印范围。
The margins of sectionnare set outside the printable area of the page.
取得或设定值，指出是否会在文件上列印修订标记。
Gets or sets a value that indicates whether revision marks are printed with the document.
取得或设定值，指出列印伺服器是否在印表机出现错误状况时发出哔声做为回应。
Gets or sets a value that indicates whether users can restart jobs after an error occurs if printer pooling is enabled.
取得或设定值，指出文件是否格式化为使用小数点间距显示及列印字元。
Gets or sets a value that indicates whether the document is formatted to use fractional point spacing to display and print characters.
取得或设定值，指出文件是否格式化为使用小数点间距显示及列印字元。
Gets or sets a value that indicates whether the document is formatted to use fractional point spacing to display and print characters.
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