What mean the letters EVS?

What mean the letters EVS?
I won’t tell lies, I shall confess.

You’ll fly from home with bags of hopes,
Of sweet bright dreams, of awe, of course,
Like children, waiting for new toys.
Poor thing, you waits will be destroyed…

You’ll throw your phrasebook soon away,
Because they talk so fast! You’ll pray
To take the right tram to your work, -
This transport scheme gets worse and worse!
Misunderstanding’s everywhere.
You scream, but no one ever care!

Your boss gets angry when you’re late,
Each day you struggle with flat mates,
The food tastes ugly, and you howl,
Remembering dishes of your mom!

It is the third month going on,
You miss your girlfriend, who’s at home,
You call your family by skype,
You cry and cry, and cry and cry.

However, you get tough and wise,
Your language’s better and, besides,
You’ve learnt the schedule of the tram,
And feel yourself a Superman.
You’re having parties every night,
On weekends is another flight,
Another memorable trip,
Amazing people, whom you meet.

Meanwhile, at home, your friends get bored,
They study further, eat, sleep, work,
They fall in love, and marry fast, -
Routine and weariness. You glance
At photos, which they make, and sigh.
You’re here, they’re far. You can’t deny,
You hope to get things back again,
But ticket’s sold for the gone train.

So, if you’re sissy, mother’s son,
You’d better stay at home and scum.
There’ll be no stress, no fears, no pain,
And anything which you could gain.

What mean the letters EVS?
I won’t tell lies, I shall confess:
Experience of Vita breviS.
I filled and killed my time at once.
I use this chance.
And you, guys, ladies?

Remark: “Vita Brevis” – life is short.