Decipher this Poem!

I saw this poem on the bus, and I thought it'd be a fun lesson for ESL students.  What do you think the last three lines say? Are you sure?


N Vwls

Ths pm hs n vwls
t dsn't rhym
nd t dsn't mk sns
Th strng thng s tht y cn ndrstnd t
Vn thgh ts mst mprnt lttrs r bsnt

Whn y rd t
smthng s mssng
jst lk whn y lv lf
th mst mprnt thngs
r smtms mssng

Max Buhman, 11th Grade