You must specify the type of formal parameters in the formal parameter list.

必须在形参表中指定形参的类型.

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The signature of an indexer consists of the number and types of its formal parameters.

索引器的签名由其形参的数量和类型组成.

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It must be followed by the function name and the parenthesized list of formal parameters.

在其后必须跟有函数名和包括形式参数的圆括号.

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