Could you tell me how this rule matches the name and the field name in it?

recently, I am doing Wechat"s template message, but the content of the template message given by Wechat is that the field description is connected with the field name. I would like to ask how the following string takes out the name and the corresponding field. it is difficult to take some fields that do not have a name in front of them

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{{first.DATA}} course name: {{keyword1.DATA}} course time: {{keyword2.DATA}} course {{remark.DATA}}

Php
Mar.01,2021
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