给定两个2D数组，将它们添加到第三个2D数组中

def merge_arrays(arr1, arr2):
    # 验证两个输入数组的维度相同
    if len(arr1) != len(arr2) or len(arr1[0]) != len(arr2[0]):
        return "输入数组维度不匹配"

    # 创建一个新的空的第三个2D数组
    merged_arr = [[0] * len(arr1[0]) for _ in range(len(arr1))]

    # 将两个输入数组的元素复制到第三个数组的对应位置
    for i in range(len(arr1)):
        for j in range(len(arr1[0])):
            merged_arr[i][j] = arr1[i][j] + arr2[i][j]

    return merged_arr

# 示例输入
arr1 = [[1, 2], [3, 4]]
arr2 = [[5, 6], [7, 8]]

# 调用函数进行合并
result = merge_arrays(arr1, arr2)

# 打印合并后的结果
for row in result:
    print(row)