Luyện nghe bài hát The Professor's Song

To "if you give me attention."
If you give me attention, I will tell you what I am.
I'm a math'matician - also something of a ham.
I have for numerous degrees, in fact I've one of each;
Of course makes me eminently qualified to teach.
I understand the subject matter thoroughly, true,
And I see why it isn't all as obvious to you.
Each lecture is a masterpiece, planned,
Yet tells me that I'm hard to understand,
And I think why.

My diagrams are of true art, you must agree,
And my handwriting is famous for legibility.
Take a word "minimum" (to choose a random word),
This was performed at a blackboard, and the wrote:

For anyone to say he cannot that, is absurd.
The anecdotes I get more amusing every year,
Though frankly, they go to prove is sometimes less than clear,
And all my are quite lucid, I am sure,
Yet everybody me that my lectures are obscure,
And I can't why.

Consider, for example, just the force of
It's inversely proportional to - let me see -
It's r^3 - no, r^2 - no, just r, I'll bet -
The sign in is plus - or is it minus, I forget -
Well, anyway, there is a force, of there is no doubt.
All these are trivial if you only think them out.
Yet students tell me, "i have memorized the year through
Ev'rything told us, but the problems I can't do."
And I think why!