其它可能遇到的问题是自变量类型不正确，指定的自变量名称不正确；或者服务器当机。
Other problems you may encounter are that the arguments are the incorrect type, the argument names are specified incorrectly; or the server may not be running.
自变量有时候会造成编程错误，试图对不可比较的类型进行比较。
An argument is sometimes made that it is a programming mistake to try to compare items of incommensurable types.
类型yyy中的xxx方法不适合zz z自变量。
The method XXX in the type yyy is not applicable for the arguments ZZZ.
自变量的值类型会自动设为默认值。
The argument scale types are defined automatically, by default.
自变量的值类型会自动设为默认值。
The argument scale types are defined automatically, by default.
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