它只能用于“指令”(参见结构表中的定义)。
It is only about "instructions" (defined in the structure table).
Streams还允许您创建自定义算子来执行特定指令。
Streams also enables you to create custom operators to perform specific instructions.
每条指令定义单独的重写规则。
同样的考量也适用于每一个结构型指令，无论是内置的还是自定义的。
These same considerations apply to every structural directive, whether built-in or custom.
未定义的符号与预处理器指令一起使用。
A symbol that was not defined was used with a preprocessor directive.
未定义的符号与预处理器指令一起使用。
A symbol that was not defined was used with a preprocessor directive.
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