问题描述：
请问这个英语句子里面定语从句怎么理解啊?current providers of ..是什么?
They note the weakness of the social networks and e-mail providers which are the current providers of informal electronic passports.
They note the weakness of the social networks and e-mail providers which are the current providers of informal electronic passports.
问题解答：
我来补答展开全文阅读