本文介绍了如何使用特殊命令在文本中生成控制字符、元字符及其组合。包括通过?C-x生成控制字符，通过?M-x生成元字符，以及通过?M-C-x生成两者的组合。此外还详细说明了这些字符对应的ASCII值。
Control characters can be generated using ?\C-x and ?\c-x
(the control version of x is x & 0x9f).
Metacharacters (x | 0x80) can be generated using ?\M-x.
The combination of meta and control is generated using and ?\M-\C-x.
You can get the integer value of a backslash character using the sequence ?\\.
?a => 97 # ASCII character
?\n => 10 # code for a newline (0x0a)
?\C-a => 1 # control a = ?A & 0x9f = 0x01
?\M-a => 225 # meta sets bit 7
?\M-\C-a => 129 # meta and control a
?\C-? => 127 # delete character
上面的一段英文，请解释一下，还有关于Control characters的知识点？
(the control version of x is x & 0x9f).
Metacharacters (x | 0x80) can be generated using ?\M-x.
The combination of meta and control is generated using and ?\M-\C-x.
You can get the integer value of a backslash character using the sequence ?\\.
?a => 97 # ASCII character
?\n => 10 # code for a newline (0x0a)
?\C-a => 1 # control a = ?A & 0x9f = 0x01
?\M-a => 225 # meta sets bit 7
?\M-\C-a => 129 # meta and control a
?\C-? => 127 # delete character
上面的一段英文，请解释一下，还有关于Control characters的知识点？
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