Message type indicator (MTI) — Four numeric digits that specify the version of the ISO8583 standard, message class, message function, and message origin.

消息类型指示符(MTI)——4个数字，指定ISO 8583标准的版本、消息类型、消息功能和消息的发起位置。

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Because map takes one argument, a function, we can use the "placeholder" indicator _ instead of a named parameter.

因为map接受一个参数，即一个函数，我们可以用_占位符来替代有名参数。

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The indicators of ecosystem integrity can be grouped into indicator species, structure-function-composition indicators, and stress-response indicators.

并从指示物种，结构-功能-组成，压力-响应等方面介绍了生态系统完整性评价指标；

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But if online behavior data doesn't function as a perfect economic indicator, it does make a fascinating mirror for the human psyche.

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