In many programming languages, a two-dimensional array is implemented as a single, continuous one-dimensional array in memory. Each element of the array is stored in a contiguous block of memory, and the elements are accessed using a set of indices that represent the row and column of the element.

For example, consider the following two-dimensional array in C:

```Copy code```int a = {
{1, 2, 3, 4},
{5, 6, 7, 8},
{9, 10, 11, 12}
};
``````

This array is stored in memory as a single, continuous one-dimensional array of integers, like this:

```Copy code```[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
``````

The two-dimensional indices `[i][j]` are translated into a single, one-dimensional index by the following formula:

```Copy code```index = i * numberOfColumns + j
``````

In this case, the number of columns is 4, so the indices `[i][j]` are translated as follows:

```Copy code```a => index = 0 * 4 + 0 = 0
a => index = 0 * 4 + 1 = 1
a => index = 0 * 4 + 2 = 2
a => index = 0 * 4 + 3 = 3
a => index = 1 * 4 + 0 = 4
a => index = 1 * 4 + 1 = 5
...
``````

This allows the array to be accessed using the familiar two-dimensional syntax, while still being stored in a continuous block of memory.

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