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。
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。
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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