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is one or both of the two expressions are correct? I saw people use them but out of direct translation. So i'd be grateful if some native speaker can tell wehter they are correct or idiomatic.
Comments 
I want to know some english idioms oftenly used
In BrE we would probably refer to the contact person, or the person to contact.
Students: We have free audio pronunciation exercises.
Try this site, guest.

http://home.t-online.de/home/toni.goeller/idiom_wm /