There is a military aid, which is different, who carried what's calledthe 'football', which is a leather section that contains the highest classifiedcommunication equipment.
请问老师:
第一个which is different 它修饰句子的什么部分?
第二个which is a leather section 是指football吗? 为何这里不是用that is a leather...?
which is different 为句子关系分句，即which的先行词为前面的 There isa military aid 这个主句的内容。后面的who引导限制性定语从句修饰aid。aid在此指人，= an assistant or helper. 所以用who引导定语从句。因为句子关系分句插入aid和who之间，所以前后用逗号把句子关系分句分隔。假如拿掉这个which从句，则二个逗号同时消失。这个which句子关系分句还可以改为下面结构：
What is different is that there is a military aidwho...
如此就能了解看出is different的主语指的是什么了。
第二个which引导非限制性定语从句，修饰“football”。非限制性定语从句不可以用that引导，你应该了解的。