第一个字段是每个记录都必须使用的唯一ID标识符。
The first field is the highly desirable unique id identifier for each record.
时区标识符是唯一地标识时区的键字段。
The time zone identifier is a key field that uniquely identifies the time zone.
时区标识符是唯一地标识时区的键字段。
The time zone identifier is a key field that uniquely identifies the time zone.
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