Replace sequences of white-space within the string with a single space.
将字符串内的空格序列替换为单个空格。
The status pulldown has a new choice, All, with a value of a single space.
状态下拉菜单有一个新选项all，其值为一个空格。
The second method calls the first with a “default” separator of a single space.
第二个方法调用第一个方法，并且传入一个空格作为“默认”分隔符。
Any empty header, such as Meta-Persistence above, must include a single space after the colon.
任何空白头部，比如上面提到的Meta -Persistence，必须在冒号之后包含一个空格。
The second method calls the first with a "default" separator of a single space.
第二个方法调用第一个方法，并且传入一个空格作为“默认”分隔符。
As a rough rule, you might consider writing 3-5 pages single space for each question.
大致而言，你不妨每题写三至五页，单行间距。
As a rough rule, you might consider writing 3-5 pages single space for each question.
大致而言，你不妨每题写三至五页，单行间距。
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