The variable name must not be a reserved word.
变量名一定不能是保留字.
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The reserved word policies are much too strict.
它的保留字策略过于严格.
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It may not be a reserved word.
列名不能是关键字.
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Notes: Either uppercase or lowercase can be use for reserved word and identifier.
注意: 大写或小写都适用于保留字及标识符.
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