Similar to an undefined external error, except that the reference is via metadata.
与未定义的外部错误类似，不同的是引用是通过元数据。
Lacking an external focus, the mind turns inward on itself and creates problems to solve, even if the problems are undefined or unimportant.
缺乏外部的兴趣焦点，注意力因此转向内部，引发需要解决的内部问题；尽管这些问题可能很模糊和不重要。
External and static variables are initialized to zero by default. Automatic variables for which is no explicit initializer have undefined (i. e., garbage) values.
外部变量和静态变量初始的时候默认值为零，自动变量在初始的时候是没有默认值的。
External and static variables are initialized to zero by default. Automatic variables for which is no explicit initializer have undefined (i. e., garbage) values.
外部变量和静态变量初始的时候默认值为零，自动变量在初始的时候是没有默认值的。
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