I am glad to meet you all.

问题描述:

I am glad to meet you all.

(我)很高兴认识你们大家.all,用作同位语,其实就是=you,能起到强调、衬托作用.
再如:
They each signed the paper.他们每个人都在文件上签了名.
each 就是做they的同位语.
代词的一种用法.
献丑.