as far as...be concerned中的concerned 怎么理解如题.

as far as sb /sth be concerned中的“as far as far as ...be concerned用法? as far as far as far as far As far as far as.so far twice as far as As Far As “as far as”是什么意思? as far as=as 用as far as sb./sth.be concerned怎么造句 as far as…be concerned一句中concerned是什么词性? as far as sb be concerned,请问,sb可以换成sth吗?如：as far as learning is concerned As far as,as long as ,as well as as far as I know as far as有哪几种意思?