FileDir 函數會傳回一個字串，其中包含目前正在讀取之表格檔案的目錄路徑。
語法：
FileDir()
Load *, FileDir( ) as X from [lib://DataFiles/Region.txt]
A field is a data asset containing values, loaded from a data source. At a basic level, a field corresponds to a column in a table. Fields are used to create dimensions and measures in visualizations.
See: Fields
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