根据下面的例子，如何在Objective c中添加数组到另一个数组中?

Here is one code,

这是一个代码,

NSMutableArray *list = [NSMutableArray arrayWithObjects:
                           [MagnetKeyValuePair keyValuePairWithKeyAndValue:@"test1" value:@"Q test"],
                           [MagnetKeyValuePair keyValuePairWithKeyAndValue:@"test2" value:@"W test"],
                           [MagnetKeyValuePair keyValuePairWithKeyAndValue:@"test3" value:@"E Test"],
                       nil];
NSMutableArray *l