Expression that evaluates either a string containing the name of an environment variable, or an integer corresponding to the numeric order of an environment string in the environment-string table.
表达式，计算为包含环境变量名称的字符串，或对应于环境字符串表中环境字符串的数字顺序的整数。
The collection of session variables is indexed by the name of the variable or by an integer index.
会话变量集合按变量名称或整数索引来进行索引。
The collection of session variables is indexed by the name of the variable or by an integer index.
会话变量集合按变量名称或整数索引来进行索引。
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