To write a function that has a two-dimensional array as an argument, you need to remember that the name of an array is treated as its address, so the corresponding formal parameter is a pointer, just as for one-dimensional arrays. The tricky part is declaring the pointer correctly. Suppose, for example, we start with this code:

int data[3][4] = { {1,2,3,4}, {9,8,7,6}, {2,4,6 8}};
int total = sum(data, 3);

What should the prototype for sum() look like? And why does the function pass the number of rows (3) as an argument and not also the number of columns (4)?
则sum()的原型是什么样的呢？函数为何将行数（３）作为参数，而将列数（４）作为参数呢？

感觉这个红色的部分翻译不对啊？