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\<emph\>[dimension]:\</emph\> インデックス範囲の最大値 (\<emph\>ubound\</emph\>) ないし最小値 (\<emph\>lbound\</emph\>) を確認する次元を示す整数値。この値を指定しない場合は、最初の次元が適用されます。
\<emph\>[dimension]:\</emph\> integer that specifies which dimension to return the upper (\<emph\>ubound\</emph\>) or the lower (\<emph\>lbound\</emph\>) boundary for. if a value is not specified, the first dimension is assumed.