Analysis of A teacher

A panama,
That eases the travelers
Get to their destination
A viaduct,
That supports the passersby
Meet up their intention .
Assisting incalculable public
With a sharp, intellect horn,
One day becomes old enough
And replaceS by another one.
Hauling each,
Across the watercourse,
Till dusk from the dawn,
The overpass
Would be frail enough
And replaces by the new one .
Competent product of manpower
For the entire mankind,
A whole lexicon of life
Indeed, is a teacher's mind .