new string[10, 2]
以下の配列になる（値をxとする)
x,x
x,x
x,x
x,x
x,x
x,x
x,x
x,x
x,x
x,x
Row(行)=10 , Column(列)=2
10が欲しいなら array.GetLength(0) -> 10
2が欲しいなら array.GetLength(1) -> 2
要素数が欲しいなら array.Length -> 20
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