前跟转义字符用于标识引用操作符开始的字符。
The character which when preceded by an escape character represents the start quote operator.
前跟转义字符用于标识引用操作符结束的字符。
The character which when preceded by an escape character represents the end quote operator.
可互操作对象引用(IOR)。
转义符可以引入一个操作符，如反引用、词操作符。
The escape operator may introduce an operator for example: back references, or a word operator.
转义符可以引入一个操作符，如反引用、词操作符。
The escape operator may introduce an operator for example: back references, or a word operator.
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