因此，我尝试通过以下方式熟悉 tikz \foreach 命令此链接然而奇怪的事情发生了。根据链接，如果我尝试同时迭代两个变量而不是一个接一个地迭代，我应该使用/来区分两者。因此，像这样的代码
\foreach \x / \y in {1/2,a/b} {``\x\ and \y''}
应该屈服
“1 and 2”“a and b”
但当我输入完全相同的代码时，我得到的却是一个平淡无奇的页面。
下面是我用于重现目的的代码：
\documentclass{article}
\usepackage{tikz}
\begin{document}
\tikz
\foreach \x / \y in {1/2,a/b} {``\x\ and \y''};
\end{document}
我在这里先向您的帮助表示感谢。
答案1
如果我编译你的示例代码，我会在日志文件中找到
Missing character: There is no ` in font nullfont!
Missing character: There is no ` in font nullfont!
Missing character: There is no 1 in font nullfont!
Missing character: There is no a in font nullfont!
Missing character: There is no n in font nullfont!
Missing character: There is no d in font nullfont!
Missing character: There is no 2 in font nullfont!
Missing character: There is no ' in font nullfont!
Missing character: There is no ' in font nullfont!
Missing character: There is no ` in font nullfont!
Missing character: There is no ` in font nullfont!
Missing character: There is no a in font nullfont!
Missing character: There is no a in font nullfont!
Missing character: There is no n in font nullfont!
Missing character: There is no d in font nullfont!
Missing character: There is no b in font nullfont!
Missing character: There is no ' in font nullfont!
Missing character: There is no ' in font nullfont!
Missing character: There is no ; in font nullfont!
这意味着 TeX 确实在尝试排版这些字母，但由于它位于 的中间tikzpicture，因此它被指示使用nullfont，这是一种内部字体，它根本没有字符，也不会产生单词间空格。
如果我删除\tikz分号，我会得到
