Once you declare an array variable, you cannot change its rank or its element data type.

宣告阵列变数后，就不可再变更其阵序或其元素资料型别。

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An array variable holds a pointer to an array object, which holds the array elements and the rank and length information.

数组变量保存指向数组对象的指针，而数组对象保存的是数组元素、秩和长度信息。

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The rank (number of dimensions) of the destination array must be the same as that of the source array.

目标数组的秩(维数)必须与源数组的秩相同。

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