"Doug Miller" wrote in message ...
Let's do a thought experiment. For the purposes of the experiment, we will
stipulate that you have expert knowledge of chemistry, and that you speak,
understand, read, and write only Polish, and no other language. Your
assignment is to teach high school chemistry in Birmingham, Alabama.

How helpful is that expert knowledge of chemistry in teaching a classroom
full
of students who can't understand anything you say?

============

University Professors are typically prime examples of that concept at work.
It works there, barely. Sometimes their tape players are hard to understand
in a classroom of 500 students too.

--

Eric