Latex
If such a space should be kept even if it falls at the end or the start of a line, use \hspace* instead.
If the space should be preserved at the top or at the bottom of a page, use the starred version of the command, \vspace*, instead of \vspace. If you want to add space at the beginning of the document, without anything else written before, then you may use.
{ \vspace*{length} }
It’s important you use the \vspace* command instead of \vspace, otherwise LaTeX can silently ignore the extra space.
在一个段落的中间产生一个20毫米的水平空白空间\hspace{20 mm} 如果LaTeX决定在指定文档的某一点的行之间使用\hspace中断，则不会产生空格，应更换\hspace由\hspace*
Hypertext Help with LaTeX:Spaces and Boxes
Network
API（Application Programming Interface,应用程序编程接口）是一种不需要理解基层代码就能调用程序的接口（Interface），参考
区块链就是去中心化分布式储存，参见阮神blog
Interesting
常识
大部分普通的痦子是因为黑色素堆积形成的，而黑色素堆积是因为肝气不足，排毒不够。所以要晚上早睡觉保证内脏及时排毒；早上要及时排便。
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