Pile the bodies high at austerlitz and waterloo.
shovel them under and let me work-
i am the grass; i cover all.
and pile them high at gettysburg
and pile them high at ypres and verdun.
shovel them under and let me work.
two years, ten years, and passengers ask the conductor:
what place is this?
where are we now?
i am the grass.
let me work.

what is the significance of the phrase "two years, ten years" in line 7?

the phrase describes the intervals between the wars.

the phrase stresses that grass needs time to do its work.

the phrase suggests that people quickly forget the past.

the phrase implies that time people heal their emotional wounds.