An array variable holds a pointer to the data constituting the array elements and the rank and length information, and an assignment copies only this pointer.
数组变量持有一个指针，它指向构成数组元素的数据及秩和长度信息，赋值语句仅复制此指针。
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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.